![]() ![]() By preventing flooding, dikes force the river to flow more quickly and with greater force. ![]() ![]() When constructed along river banks, dikes control the flow of water. More often, people construct dikes to prevent flooding. Water Dikes Dikes used to hold back water are usually made of earth. A dike swarm is usually created by the same geologic event, such as a volcano. Dikes sometimes show up in swarms of several hundred dikes. But since Earth is constantly moving and shifting, the dike can end up horizontal after enough time goes by. Dikes are often vertical, or straight up and down. A dike is, therefore, younger than the rocks surrounding it. A dike will either flow or build up in a fissure, pushing the surrounding rock to the side. Dikes frequently intrude on open spaces between rocks, called fissures. Sedimentary dikes, also called clastic dikes, are formed from sedimentary rock. Sedimentary rock is made of minerals and sediments that build up over time. Magmatic dikes are formed from igneous rock. ![]() Igneous rock is formed after magma, the hot, semiliquid substance that spews from volcanoes, cools and eventually becomes solid. Dikes are made of igneous rock or sedimentary rock. Dikes are usually visible because they are at a different angle, and usually have different color and texture than the rock surrounding them. Dikes cut across the other type of rock at a different angle than the rest of the structure. Geologic Dike A geologic dike is a flat body of rock that cuts through another type of rock. In geology, a dike is a large slab of rock that cuts through another type of rock. A dike is a barrier used to regulate or hold back water from a river, lake, or even the ocean. ![]()
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