A) A coal burning generator B) A wood burning stove C) A gasoline burning automobile D) An automobile that operates on fuel cells
A) The moon B) Running water C) Heat from within the Earth's crust D) The sun
A) The number of clouds in the sky B) The speed of the wind C) The amount of moisture in the air D) The state of the atmosphere at any particular time
A) Magnetic Field B) Atmosphere C) Temperature D) Rotation
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) The Earth's changing distance from the sun C) The Earth's rotation D) Changes in the sun's intensity
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) High plateaus B) Deep craters C) Sunken plains, or seas D) Mountains
A) Electricity B) Light C) Motion D) Heat
A) Temperature and pressure B) Lift and thrust C) Wind and rain D) Motion and time |