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How Big is the Earth? (1:43)
How big is the Earth? Find out in this HowStuffWorks video!
Sir Martin Rees Talks About Earth (18:11)
Watch this video showing how the Earth works on HowStuffWorks. Cosmologist Sir Martin Rees explains why the 21st century is a unique and pivotal century not just for mankind but for the entire planet. Learn about how the Earth works in this video... More »
Thailand Could Sink Into the Ocean (1:22)
Watch this video to see how global warming and flooding are combining to sink Thailand underwater. Experts say Bangkok is steadily sinking because of the amount of ground water pumped out from beneath it while some villages on the coast are already... More »
Sketches of the World: Introduction to Nature (2:08)
The natural world contains many different landscapes and life forms. Mountains are some of the most visible landscapes, but many other landscapes also exist.
Life in the Desert: Interactions Among Species (3:55)
Desert plants and animals form relationships with others that share their habitat to form a biological community. A keystone species is a species that dominates an ecosystem in numbers and in its importance to other species.


