What affect does acid rain have on the pH of natural lakes and streams?

Which of the following natural conditions can affect the atmosphere's ability to disperse pollutants?

What is a colorless, odorless gas found in car exhaust that contributes to air pollution?

Which of the following men was the first U.S. citizen to orbit Earth?

Which of the following can launch an object into space?

What is the speed of light?

WHy are space telescopes so important to our current study of astronomy?

Which type of radiation has a longer wavelength than visible light does?

Which space probe visited Venus?

When the Moon moves between the Sun and Earth and casts a shadow on Earth's surface, there is a(n) ___.

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