A) An automobile that operates on fuel cells B) A wood burning stove C) A coal burning generator D) A gasoline burning automobile
A) Running water B) Heat from within the Earth's crust C) The moon 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) Magnetic Field C) Rotation D) Temperature
A) The sun causes plants to wither and die B) The sun powers life on Earth C) The sun protects life on Earth 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 reflects light from stars B) Because it reflects sunlight C) It makes it's own light D) It reflects light from Earth
A) Deep craters B) High plateaus C) Mountains D) Sunken plains, or seas
A) Light B) Electricity C) Motion D) Heat
A) Temperature and pressure B) Motion and time C) Lift and thrust D) Wind and rain |