A) A coal burning generator B) A wood burning stove C) A gasoline burning automobile D) An automobile that operates on fuel cells
A) Running water B) Heat from within the Earth's crust C) The sun D) The moon
A) The speed of the wind B) The number of clouds in the sky C) The state of the atmosphere at any particular time D) The amount of moisture in the air
A) Temperature B) Magnetic Field C) Rotation D) Atmosphere
A) The sun powers life on Earth B) The sun protects life on Earth C) The sun causes plants to wither and die D) The sun damages 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 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) High plateaus D) Deep craters
A) Light B) Electricity C) Heat D) Motion
A) Motion and time B) Temperature and pressure C) Wind and rain D) Lift and thrust |