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