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

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

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

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

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

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

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

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

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