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

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

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

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

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

A) The Earth's changing distance from the sun
B) The Earth's rotation
C) Changes in the sun's intensity
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) Sunken plains, or seas
B) High plateaus
C) Mountains
D) Deep craters

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

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