Atmosphere, Oceans, and Earth Systems
Earth is not just rock and water — it is wrapped in air and covered by oceans, and these systems constantly interact. Understanding the atmosphere, the oceans, and how Earth’s systems work together explains weather, climate, and much more. This lesson gives you the big picture. The Atmosphere The atmosphere is the layer of gases […]
Natural Resources
Natural resources are materials from the Earth that people use — water, air, soil, minerals, and fuels. A key skill on the test is sorting these into two groups: renewable resources that nature replaces, and nonrenewable resources that run out. This lesson makes the distinction clear. Renewable Resources Renewable resources are replaced by nature about […]
