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 sun C) Running water 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) Atmosphere B) Magnetic Field C) Rotation D) Temperature
A) The sun causes plants to wither and die B) The sun protects life on Earth C) The sun damages life on Earth D) The sun powers life on Earth
A) The tilt of the Earth on it's axis B) Changes in the sun's intensity C) The Earth's rotation D) The Earth's changing distance from the sun
A) It reflects light from Earth B) Because it reflects sunlight C) It makes it's own light D) It reflects light from stars
A) Sunken plains, or seas B) Mountains C) Deep craters D) High plateaus
A) Heat B) Motion C) Electricity D) Light
A) Temperature and pressure B) Lift and thrust C) Wind and rain D) Motion and time |