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