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

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

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

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

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

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

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

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

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