Monday, March 25, 2013

Surface Water & Global Temperatures (Page 90)

Why would San Francisco--compared with Norfolk, Virginia--have warmer winters and cooler summer even though both of the cities are located at the same latitude?
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The temperatures of water and land, and their abilities to hold and release energy from the sun, are very different.
Water can absorb a lot of heat energy from the sun with little change in temperature, whereas land is just the opposite (absorbs heat energy relatively quickly, and releases heat energy relatively quickly).
Wind tends to travel from West to East at the latitudes of SF and Norfolk. The wind that flows through SF tends to be warmer in the winter and cooler in the summer, thus allowing the two cities to have different types of climates during winter and summer.
This is phenomenon is known as thermal inertia.

Temperatures on earth are moderated in different ways. Sea ice for example is a temperature moderator. Ice is more effective at moderating temperatures than certain rocks like granite. Ocean currents are waters that carry and hold much heat energy from the sun.

Waters from the equator flows towards the poles, which allows the oceans near the poles to remain ice free.

More powerful than ocean currents are heat transfers that occur via water vapor in the atmosphere. This movement of water vapor in the atmosphere travels to different places across the earth and moves heat around to help moderate the temperatures on the planet.

Without moderate temperatures, the earth would be too cold or too hot for life to exist as we know it.

Thursday, March 21, 2013

Thermal Characteristics of Water

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Thermal Characteristics of Water
Heat and temperature

Monday, March 18, 2013

The Chemistry of Water

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Water is interesting and intriguing. Without water there is no life as we know it. We humans take water for granted.

(1. Describe how water molecules are bonded) Water's molecular structure is bonded together via covalent chemical bond, in which "each hydrogen nucleus is bound to the central oxygen atom by a pair of electrons that are shared between them." (http://goo.gl/ktSTT)

(2. Describe how the positive and negative charges of water are distributed.) Water is considered electrically neutral. The charges--positive and negative--of water are not uniformly distributed.
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The negative charge of water is located towards the oxygen side of the molecule, while the positive charge is located towards the hydrogen side.

(3. Describe the chemistry of water that allows an insect to walk on water.) The surface of water acts like a layer of elasticity when a small weight is placed upon it. This phenomenon is called the surface tension of water.

(4. What is unique about water and its density?) Typically most substances when they changes phases from liquid to a solid, the substance increases its mass. Not water. When water turns into a solid (ice), its mass decreases, and that's why ice floats on top of water.

Friday, March 15, 2013

The Great Depression - Hardships & Suffering (Pg. 104)

The Great Depression (TGD) was an incredibly difficult economic time for many Americans. The citizens had a lot of problems to deal with, one in particular was the Dust Bowl.
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(1.) The Dust Bowl took place in the middle of the United States, and it occurred when farmers over-planted crops that eventually failed because of a drought that lasted for seven years. Because of the drought, the land and dirt was exposed to the wind, which blew the dirt into the air, causing an environmental disaster, causing a lot of people to get sick and/or die because of the dirty air. Instead of planting just a portion of the land, the greedy farmers chose to plant cash crops and remove the prairie grasses, which had the ability to survive droughts, and hold the dirt down.

(2.) (a.) TGD affected children because they were malnourished--not enough to eat--and contracted diseases related to diet. They also couldn't go to school because the state did not have enough to keep schools open.
(b.) Families were affected by TGD because daily living was a struggle with little or no money to buy the most basic of needs.
(c.) Women had to get job, and they faced sexism because many people at the time felt that with husbands unemployed, moms should not be out of the house at work.
(d.) Men were affected by TGD because they couldn't support their families. There were very little jobs, and if a dad couldn't support his family, he would feel useless. Many left home to become hoboes.
(e.) People of color (Mexicans and African-Americans) experienced racism from whites.

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(3.) Hoboes were men who wandered around the country, jobless. They got around on train boxcars.

(4.) An enduring effect of TGD was that people saved, saved, saved. They didn't every want to be poor again.

Monday, March 4, 2013

The Roaring 1920’s: People, Places and Events



1. THE NEW URBAN SCENE   People from farms all over the United States were moving to cities because that’s where all the new work was. Life in these booming cities was far different from the slow-paced, everybody-knows-your-business type of life in America's smaller, rural towns. Chicago, for instance, was an industrial powerhouse, home to native-born whites and African Americans, immigrant Polish, Irish, Russians, Italians, Swedes, Arabs, French, and Chinese. Each day, an estimated 300,000 workers, 150,000 cars and buses, and 20,000 trolleys filled the vibrant downtown. At night people crowded into incredible-looking movie theaters and vaudeville houses offering live variety shows.
2. For small-town migrants, adapting to the city demanded changes in thinking as well as in everyday living. The city was a world of competition and constant change. City dwellers read and argued about current scientific and social ideas. They judged one another by accomplishment more often than by someone’s background. City dwellers also tolerated drinking, gambling, and casual dating and sex—behaviors considered shocking and sinful in small towns.
For all its color and challenge, the city could be impersonal and scary. Streets were filled with strangers, not friends and neighbors. Life was fast-paced, not leisurely. The city demanded endurance.
Science and Religion Clash Another bitter controversy highlighted the growing rift between traditional and modern ideas during the 1920s. This battle raged between fundamentalist religious groups and secular (non-religious, separate from religion) thinkers over the validity of certain scientific discoveries.
AMERICAN FUNDAMENTALISM    The Protestant movement grounded in a literal (word-for-word) interpretation of the Bible was known as fundamentalism. Fundamentalists were skeptical of scientific knowledge; they argued that all important knowledge could be found in the Bible. They believed that the Bible was inspired by God, and that therefore its stories in all their details were true.
   Their beliefs led fundamentalists to reject the theory of evolution advanced by Charles Darwin in the 19th century—a theory stating that plant and animal species had developed and changed over millions of years. The claim they found most unbelievable was that humans had evolved from apes. They pointed instead to the Bible's account of creation, in which God made the world and all its life forms, including humans, in six days.
THE SCOPES TRIAL     In March 1925, Tennessee passed the nation's first law that made it a crime to teach evolution. Immediately, the American Civil Liberties Union (ACLU, is a group of attorneys that protect free speech rights) promised to defend any teacher who would challenge the law. John T. Scopes, a young biology teacher in Dayton, Tennessee, accepted the challenge. In his biology class, Scopes read this passage from Civic Biology: “We have now learned that animal forms may be arranged so as to begin with the simple one-celled forms and culminate with a group which includes man himself.” Scopes was promptly arrested, and his trial was set for July.
The ACLU hired Clarence Darrow, the most famous trial lawyer of the day, to defend Scopes. William Jennings Bryan, three-time Democratic candidate for president and a devout fundamentalist, served as a special prosecutor. There was no real question of guilt or innocence: Scopes was honest about his action. The Scopes trial was a fight over evolution and the role of science and religion in public schools and in American society.
This clash over evolution, the Prohibition experiment, and the emerging urban scene all were evidence of the changes and conflicts occurring during the 1920s. During that period, women also experienced conflict as they redefined their roles and pursued new lifestyles.
THE FLAPPER    During the twenties, a new ideal emerged for some women: the flapper, a young woman who embraced freedom and the new fashions and urban attitudes of the day. Tight-fitting felt hats, bright waist-less dresses an inch above the knees, skin-toned silk stockings, sleek pumps, and strings of beads replaced the dark and prim ankle-length dresses, whalebone corsets, and petticoats of Victorian days. Young women clipped their long hair into boyish bobs and dyed it jet black.
Many young women became more assertive. In their quest for equal status with men, some began smoking cigarettes, drinking in public, and talking openly about sex—actions that would have ruined their reputations not many years before. They danced the fox trot, camel walk, tango, Charleston, and shimmy with abandon.
   Attitudes toward marriage changed as well. Many middle-class men and women began to view marriage as more of an equal partnership, although both agreed that housework and child-rearing remained a woman's job.
THE DOUBLE STANDARD    Magazines, newspapers, and advertisements promoted the image of the flapper, and young people openly discussed dating and relationships in ways that scandalized their elders. Although many young women donned the new fashions and disregarded tradition, the flapper was more an image of rebellious youth than a widespread reality; it did not reflect the attitudes and values of many young people. During the 1920s, morals loosened only so far. Traditionalists in churches and schools protested the new casual dances and women's acceptance of smoking and drinking.
   In the years before World War I, when men “courted” women, they pursued only women they intended to marry. In the 1920s, however, casual dating became increasingly accepted. Even so, a double standard —a set of principles granting greater sexual freedom to men than to women—required women to observe stricter standards of behavior than men did. As a result, many women were pulled back and forth between the old standards and the new.
LINDBERGH'S FLIGHT   America's most beloved hero of the time wasn't an athlete but a small-town pilot named Charles A. Lindbergh, who made the first nonstop solo flight across the Atlantic. A handsome, modest man from Minnesota, Lindbergh decided to go after a $25,000 prize offered for the first nonstop solo transatlantic flight. On May 20, 1927, he took off near New York City in the Spirit of St. Louis. After 33 hours and 29 minutes, Lindbergh set down at Le Bourget airfield outside of Paris, France, amid beacons, searchlights, and mobs of enthusiastic people.
   Paris threw a huge party. On his return to the U.S., New York showered Lindbergh with ticker tape, the president received him at the White House, and America made him its idol. In an age of sensationalism, excess, and crime, Lindbergh stood for the honesty and bravery the nation seemed to have lost.
The Harlem Renaissance Flowers in New York Many African Americans who migrated north moved to Harlem, a neighborhood on the Upper West Side of New York's Manhattan Island. In the 1920s, Harlem became the world's largest black urban community, with residents from the South, the West Indies, Cuba, Puerto Rico, and Haiti. James Weldon Johnson described Harlem as the capital of black America.
Like many other urban neighborhoods, Harlem suffered from overcrowding, unemployment, and poverty. But its problems in the 1920s were eclipsed by a flowering of creativity called the Harlem Renaissance, a literary and artistic movement celebrating African-American culture.
AFRICAN AMERICANS AND JAZZ   Jazz was born in the early 20th century in New Orleans, where musicians blended instrumental ragtime and vocal blues into an exuberant new sound. In 1918, Joe “King” Oliver and his Creole Jazz Band traveled north to Chicago, carrying jazz with them. In 1922, a young trumpet player named Louis Armstrong joined Oliver's group, which became known as the Creole Jazz Band. His talent rocketed him to stardom in the jazz world.