Earth Science 2nd Semester Final

A brief solar outburst that lasts approximately one hour and releases enormous amounts of energy in the form of ultraviolet, radio, and x-ray radiation is called

• nuclear fusion

• solar flare

• explosion

Solar flares often result in the appearance of

• auroras

• Elvis

• Eclipses

Energy emitted from the sun by solar flares can cause ____________.

• higher tides in the ocean

• disruption of wireless communications and electrical grids

• volcanoes

Sunspots appear dark because they are ___.

• relatively cool

• deep holes

• solid

Stellar distances are usually expressed in what units?

• feet

• miles

• light-years

The sun is believed to be _________.

• 4.5 billion

• 4.5 trillion

• 4.5 million

Compared to other stars, the sun is

• extremely small

• about average size

• shrinking

Which type of radiation has the shortest wavelength?

• Gamma rays

• x-rays

• visible light

In astronomy, the Doppler Effect is used to determine _____.

• where Pluto is located

• whether a star is moving away from or toward Earth

• whether a star is moving away from or toward Pluto

What happens to the hydrogen that disappears in nuclear fusion?

• Hydrogen fuses into helium

• It is converted into uranium.

• No hydrogen disappears in nuclear fusion