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

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

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

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

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

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

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

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

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