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