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