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

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

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

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

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

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

A) It reflects light from Earth
B) It reflects light from stars
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) Motion
B) Heat
C) Light
D) Electricity

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