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Looge oma Kopeeri

. Earth has a layered structure that consists of the inner core, outer core, mantle, and crust. Much of the planet's mantle consists of magma. This magma can push through holes or cracks in the crust, causing a volcanic eruption.
Erosion breaks down rocks into small pieces known as sediment. This sediment is carried away by wind or water. The sediment eventually lands somewhere as sand or mud. Over time, new sediment piles on top of the old. The older layers become compressed and hard. In time, the sediment turns to rock.
. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form Metamorphic rocks
When pressure builds up, eruptions occur. In an eruption, gases and rock shoot up through the opening and spill over or fill the air with lava fragments. Eruptions can cause lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. The danger area around a volcano covers about a 20-mile radius.
. Sediment can come from soil erosion or from the decomposition of plants and animals. Wind, water and ice help carry these particles to rivers, lakes and streams.

Loodud üle 30 miljoni süžeeskeemi

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