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