A) A wood burning stove
B) A gasoline burning automobile
C) A coal burning generator
D) An automobile that operates on fuel cells

A) Heat from within the Earth's crust
B) The sun
C) The moon
D) Running water

A) The state of the atmosphere at any particular time
B) The amount of moisture in the air
C) The number of clouds in the sky
D) The speed of the wind

A) Atmosphere
B) Temperature
C) Rotation
D) Magnetic Field

A) The sun powers life on Earth
B) The sun protects life on Earth
C) The sun causes plants to wither and die
D) The sun damages life on Earth

A) The tilt of the Earth on it's axis
B) The Earth's changing distance from the sun
C) The Earth's rotation
D) Changes in the sun's intensity

A) It reflects light from Earth
B) Because it reflects sunlight
C) It reflects light from stars
D) It makes it's own light

A) Mountains
B) Deep craters
C) High plateaus
D) Sunken plains, or seas

A) Motion
B) Light
C) Heat
D) Electricity

A) Motion and time
B) Lift and thrust
C) Wind and rain
D) Temperature and pressure