Labor Unions during the 1920's

The Labor Movement in the 1920's by Danny Blas on GoAnimate

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Deep Ocean Trenches and Island Arcs

Deep ocean trenches occur at convergent plate boundaries, where an oceanic plate subducts, or sinks below, another plate, causing a deep valley at the point where the two plates meet.

In this video animation, two characters discuss island arcs and ocean trenches, which tend to form adjacent, or next to, each other. 

Ocean Trenches & Island Arcs by Danny Blas and Adanna Knox-luli on GoAnimate

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Pahoehoe Lava Flows

Here's a video from Russia, showing a low-viscosity lava flow: http://www.utsandiego.com/video/play/51542/