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