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

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

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

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

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

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

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

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

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

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