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Hypothesis
A testable prediction or possible explanation for something.
Theory
A well-supported explanation based on lots of evidence and testing.
Law
A rule in science that describes what happens consistently in nature.
Exosphere
The outermost layer of Earth's atmosphere.
Lithosphere
Earth's solid outer layer, including the crust and upper mantle.
Hydrosphere
All of the water on Earth, including oceans, lakes, rivers, and groundwater.
Atmosphere
The layer of gases surrounding Earth.
Biosphere
All parts of Earth where living things exist.
Mass
The amount of matter in an object.
Density
How much mass is packed into a certain amount of space.