Earth in space unit 2/1

What is true about Earth's motion through space?

• The Earth's revolution changes the sun, 
• the Earth's rotation causes annual changes in surface temps
• the tilt of Earth's axis and its revolution around the sun produces seasons
• The Earth's precession affects the amount of heat on Earth

Sunscreen is used to protect skin from exposure to the sun by blocking

• gamma rays
• visible light
• x rays
• ultraviolet light

How does a straight alignment between Earth, the sun, and moon impact tides

• it produces the greatest changes between high and low tides
• it produces the least change in high and low tides
• it produces semidiurnal tides
• it produces diurnal tides

Which of the following best explains why grass on a distant hill appears green?

• grass reflects all colors except green
• grass absorbs only green light
• grass reflects green light and absorbs all other colors
• grass transmits green light into other colors

Which describes the difference between nuclear fission and nuclear fusion?

• fission occurs in stars and fusion occurs in nuclear power plants
• fission involves fusing atoms together and fusion splits atoms
• Fission occurs in nuclear power plants and fusion occurs in stars
• fusion fission blah blah why should I care?

How does heat from the sun get to Earth?

• by radiation, using electromagnetic waves to transfer the heat
• by convection using liquids and gases to transfer heat
• by conduction, using solids to transfer heat
• by absorption using primary waves to transfer heat

Why do green plants require solar energy?

• to produce their own food
• to absorb nitrogen
• to release CO2 into the atmosphere
• to decompose dead remains

How does the sun produce energy?

• nuclear fission
• radioactive decay
• nuclear fusion
• ionic bonding

Which of the following chemical reactions produces sun's energy?

• helium nuclei are combined by nuclear fission
• oxygen is present to cause combustion of solar fuel
• hydrogen nuclei combine through nuclear fusion into helium
• helium and oxygen break down through nuclear fusion

How is solar energy essential to plants?

• solar energy maintains internal temperature of plants
• solar energy is converted to chemical energy used by plants
• solar energy signals plants to lose their leaves in fall
• solar energy regulates the consumption of oxygen by the plants