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

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

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

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

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

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

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

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

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

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