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

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

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

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

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

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

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

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