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

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

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

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

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

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

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

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

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