Answer:
The five process bu which rocks can change from one form to another are -
1. Weathering 2. Metamorphism 3. Cooling and crystallization 4. Lithification of sediments 5. Igneous rocks change into metamorphic rocks
Explanation:
The processes by which rocks can change from one form to another are as follows :
1. Weathering : It wears/breaks down the rocks at the surface of Earth’s into smaller pieces.
2. Metamorphism : This changes the entire texture as well as the mineral composition of the rock under conditions of extremely high temperature and pressure.
3. Cooling and crystallization from a molten magma material results in the generation of igneous rocks.
4. Lithification of sediments with proper compaction and cementation leads to the formation of consolidated sedimentary rocks.
5. Igneous rocks change into metamorphic rocks when subjected to high temperature and pressure conditions deep inside the Earth.
Answer: In geography, a plain is a flat, sweeping landmass that generally does not change much in elevation. Plains occur as lowlands along valleys or on the doorsteps of mountains, as coastal plains, and as plateaus or uplands.
In a valley, a plain is enclosed on two sides, but in other cases a plain may be delineated by a complete or partial ring of hills, by mountains, or by cliffs. Where a geological region contains more than one plain, they may be connected by a pass (sometimes termed a gap). Coastal plains would mostly rise from sea level until they run into elevated features such as mountains or plateaus.
Plains are one of the major landforms on earth, where they are present on all continents, and would cover more than one-third of the world's land area. Plains may have been formed from flowing lava, deposited by water, ice, wind, or formed by erosion by these agents from hills and mountains. Plains would generally be under the grassland (temperate or subtropical), steppe (semi-arid), savannah (tropical) or tundra (polar) biomes. In a few instances, deserts and rainforests can also be plains.
Plains in many areas are important for agriculture because where the soils were deposited as sediments they may be deep and fertile, and the flatness facilitates mechanization of crop production; or because they support grasslands which provide good grazing for livestock.
Explanation:
The speed of a river varies from close to 0 m/s to 3.1 m/s (7 mph). Factors that affect the speed of a river include the slope gradient, the roughness of the channel, and tides. Rivers tend to flow from a higher elevation to a lower elevation.
<span>It was caused by irregular fluctuations in ocean temperatures, dry climates, and poor farming techniques.</span>
