Briefly describe the three major classes of rocks, including how they are formed and examples of each type.
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Rock is a combination of one or more minerals that are found in the earth's crust. The three major categories are sedimentary, igneous, and metamorphic. Sedimentary rocks include sandstone, shale, and limestone. They result from the formation of sediments from the erosion of existing rocks, along with the remains of dead plants and animals. These sediments are carried by water, wind, or gravity to a place where they are deposited. As they accumulate over time, the lower layers are subjected to immense pressures by the upper layers. Igneous rock is cooled and hardened magma that has moved up from the earth's upper mantle. Over time these rocks are exposed. Igneous rocks include granite and lava. Metamorphic rock includes anthracite, slate, and marble and is formed when preexisting rocks are subjected to high temperature and pressure, and are transformed by the changing of its existing crystalline structure and properties.
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When the current in a lamp is increased, the lamp glows
A. as before. B. dimmer. C. brighter. D. none of the above
Imagine that all minerals found in rocks were the same color. What information would you no longer be able to infer?
A. Composition B. Cooling rate C. Texture
Civilization first emerged in China along the banks of the ______ river.
A. Chang Jiang (Yangtze) B. Huang He (Yellow) C. Xi Jiang (West) D. Pearl
Upwelling ________
A) is the flow of warm water upward toward the ocean surface B) transports oxygen from deep to surface waters C) occurs in areas where there are no currents D) brings benthic nutrients to the ocean surface promoting high primary productivity E) occurs when winds blow at right angles to a coastline