Motion
June 12, 2026 1:57 pmA roller coaster speeds down a hill while a merry-go-round spins and spins. Motion is movement in many different ways. Learn what causes motion, how we measure the movement, and...
1195 Search Results for body-systems-need-to-know
Plants
June 12, 2026 12:40 pmPlants are crucial to life on Earth. They live and grow in all sorts of different environments across the planet. In every ecosystem, plants have an important role to play....
Investing
June 12, 2026 1:42 pmHow might someone turn their money into more money? They could invest it! Learn all about investing. Discover how people buy stocks and bonds, why investing can be risky, and...
Protists
June 12, 2026 12:40 pmLife is everywhere around Earth, but some of the smallest life-forms are the most diverse. Protists can be found in water, on land, and floating through the air. Although these...
Mountains and Cliffs
June 12, 2026 1:57 pmMountains and cliffs tower over the land around them. Many formed over thousands or even millions of years and are still changing to this day. Explore more about these landforms...
The Revolutionary War
June 12, 2026 2:46 pmAmerican colonists were sick of following the rules of a government across the ocean. So, they fought back in the Revolutionary War. Learn about the war that changed history with...
The Dust Bowl
June 12, 2026 2:39 pmWinds whipped dark clouds of dust across the dry, open croplands of the Great Plains. How did this tragedy begin and what took the country through the worst of this...
Vertebrates
June 12, 2026 12:40 pmVertebrates are some of the largest animals on Earth. They live in water and on land across the planet, playing an important role in almost every ecosystem. Explore this animal...
The Lewis and Clark Expedition
June 12, 2026 2:43 pmBefore technology and maps there were boats and explorers. Lewis and Clark led the Corps of Discovery through previously unmapped lands in the west of the United States. With the...
Earth, the Sun, and the Moon
June 12, 2026 1:16 pmIf you look up at the sky, you may spot the sun or the moon. These space objects are far away, but they still affect life on Earth. Explore Earth,...
Animal and Plant Extinction
June 12, 2026 12:50 pmFury faces, scaly flippers, and green vines are vanishing. Why are so many animals and plants disappearing? Climate change is pushing a wave of extinction across the planet. Explore the...
The Rise and Fall of Ancient Greece
June 12, 2026 2:46 pmGreece was once one of the most prominent civilizations in the world. What led to its impressive power and amazing accomplishments? Explore more about the rise and fall of ancient...