Systems

Earth and Sun

right distance for water in three phases
tilt produces the seasons

Energy

heat

higher energy makes materials hotter (more heat)
atoms more active, move further apart
lowers density, hot air rises

Source of Sun's energy
Sources of Earth's energy
Sources of Energy for plants
Sources of Energy for animals
First Law of Thermodynamics
Second Law of Thermodynamics

Useful links:

Earth Science Picture of the Day

Return to Intro to Environmental Science syllabus