A collection of parts that move together is known as a_______________.
The _______________ is an Earth system that includes all living things, including humans.
The _______________ is an Earth system that includes rock, soil, and sediments.
The _______________ is made up of the outer, rocky parts of Earth and includes the crust and the outermost part of the mantle.
The _______________ is made up of all the water on, under, or above Earth's surface.
The _______________ is the layer of mixed gases in the air that surrounds Earth.
Which word is defined as depending on one another?
Which word is defined as making a clear difference?
What does "molten" mean?
Gases that trap heat are called _____________.