geomorphology & earth landforms section 7 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (d)

Answer: (b)

The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona.

It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe. President Theodore Roosevelt was a major proponent of the preservation of the Grand Canyon area. A number of processes combined to create the views that we see in today’s Grand Canyon.

The most powerful force to have an impact on the Grand Canyon is erosion, primarily by water (and ice) and second by the wind. Other forces that contributed to the Canyon’s formation are the course of the Colorado River itself, volcanism, continental drift and slight variations in the earth’s orbit which in turn causes variations in seasons and climate.

Answer: (c)

Magma is a mixture of molten or semi-molten rock, volatiles and solids that is found beneath the surface of the Earth. When magma erupts from a volcano or other vent, the molten rock is referred to as lava.

When lava cools on the Earth’s surface and forms a solid structure, it is called igneous rock.

Answer: (b)

The Himalayas, lying in Indian territory, is spread over a length of about 2,500 km and a width of 220 to 300 km.

It covers partially/fully twelve states/provinces of India viz., Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam and West Bengal.

Answer: (a)

Metamorphic rocks are rocks that have “morphed” into another kind of rock. These rocks were once igneous or sedimentary rocks.

How do sedimentary and igneous rocks change? The rocks are under tons and tons of pressure, which fosters heat build-up, and this causes them to change. If you exam metamorphic rock samples closely, you’ll discover how flattened some of the grains in the rock are.