A) An automobile that operates on fuel cells B) A gasoline burning automobile C) A wood burning stove D) A coal burning generator
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 amount of moisture in the air C) The state of the atmosphere at any particular time 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 causes plants to wither and die C) The sun powers life on Earth D) The sun protects life on Earth
A) The Earth's changing distance from the sun B) The tilt of the Earth on it's axis C) Changes in the sun's intensity 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) High plateaus D) Deep craters
A) Electricity B) Heat C) Light D) Motion
A) Wind and rain B) Lift and thrust C) Temperature and pressure D) Motion and time |