Lesson 1: Matter and Energy in Earth's System

Front

atmosphere

Back

the relatively thin layer of gases that forms Earth's outermost layer

Front

geosphere

Back

the densest part of Earth, including the crust, mantle, and core

Front

hydrosphere

Back

the portion of Earth that consists of water in any of its forms, including oceans, glaciers, rivers, lakes, groundwater and water vapor

Front

cryosphere

Back

the portion of the hydrosphere that is frozen, including all the ice and snow on land, plus sea and lake ice

Front

biosphere

Back

the parts of Earth that contain living organisms

Front

energy

Back

the ability to do work or cause change

Front

system

Back

a group of parts that work together as a whole

Front

feedback

Back

a loop in which a signal or action triggers another signal or action