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

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

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

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

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

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

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

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

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