A) A wood burning stove B) A coal burning generator C) An automobile that operates on fuel cells D) A gasoline burning automobile
A) The sun B) Heat from within the Earth's crust C) Running water D) The moon
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) Temperature B) Magnetic Field C) Rotation D) Atmosphere
A) The sun protects life on Earth B) The sun causes plants to wither and die C) The sun powers life on Earth D) The sun damages life on Earth
A) The tilt of the Earth on it's axis B) The Earth's rotation C) The Earth's changing distance from the sun D) Changes in the sun's intensity
A) Because it reflects sunlight B) It reflects light from Earth C) It reflects light from stars D) It makes it's own light
A) Sunken plains, or seas B) High plateaus C) Deep craters D) Mountains
A) Electricity B) Heat C) Light D) Motion
A) Temperature and pressure B) Wind and rain C) Motion and time D) Lift and thrust |