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Unformatted text preview: D ) lithosphere, mantle, and core What is the term for swirling clouds of hydrogen gas out of which stars are born? A ) protostar B ) constellation C ) comet D ) nebulae Where something is between the equator and pole on Earth's surface is identified as being on a (an) A ) meridian B ) longitude C ) latitude D ) tropic Today, astronomers believe the universe is about how old? A ) 4.5 billion years B ) 7 billion years C ) 13.6 billion years D ) 21 billion years Rocks that form from a mass of molten material are called A ) igneous B ) metamorphic C ) magma D ) sedimentary As viewed from Earth, the Sun moves completely around the ecliptic in one A ) day B ) month C ) year D ) century...
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- Spring '09
- Science, divergent plate boundaries, 4.5 billion years, 7 billion years, 13.6 billion years, 21 billion years