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

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

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

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

A) The sun protects life on Earth
B) The sun damages life on Earth
C) The sun powers 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) Because it reflects sunlight
C) It makes it's own light
D) It reflects light from stars

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

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

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