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