Earth's energy budget

What is the primary source of energy for the Earth?

• Coal
• Wind power
• Natural gas
• The sun

What percentage of the sun's energy is reflected back to space even before turning into thermal energy?

• 10%
• 30%
• 75%
• 100%

What is the process called in which gasses in Earth's atmosphere trap heat and send it back down to Earth's surface making it 60 F warmer than it would be?

• El nino
• Greenhouse effect
• Reconvectionation
• Global warming

Resources that can be replaced in 100 years or less are called......

• exaustable
• renewable
• nonrenewable
• recyclable

Which of the following is not a fossil fuel?

• coal 
• oil
• uranium
• natural gas

Which of the following is a nonrenewable resource?

• Solar energy
• Wind energy
• Biomass
• Oil/ petroleum

Which of the following is a human impact that contributes to global warming?

• Change of the Earth's seasons
• El nino
• Burning fossil fuels
• volcanic eruptions

What type of energy makes use of burning plant materials and animal droppings as a source of fuel?

• Geothermal
• Hydroelectric
• Biomass
• Petroleum