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

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

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

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

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

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

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

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

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

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