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How the Ice Age Worked
history.howstuffworks.com/historical-events/ice-age.htm
An ice age is a period of cooling, marked by the presence of glaciers and ice sheets. Learn how an ice age works and if we're in an ice age right now.
How John Muir Helped Pave the Way for the National Park System
history.howstuffworks.com/historical-figures/john-muir.htm
Muir was personally involved in the creation of Yosemite, Sequoia, Mount Rainier, Petrified Forest and Grand Canyon national parks and earned the title of "Father of Our National Park System."
What Is a Glacier? Everything to Know About These Ice Masses
science.howstuffworks.com/environmental/earth/geophysics/glacier.htm
Glaciers are rivers of ice and are the largest moving objects on Earth. Learn about glaciers and find out how much freshwater are frozen in glaciers.
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