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