Earth Surface Dynamics: 18 MCQs with answers

Volcanism

Endogenic processes are driven by internal heat and include volcanism, diastrophism, and mountain building. Weathering, erosion, and deposition are exogenic processes.

Weathering

Weathering is an exogenic process that breaks down rocks at the Earth's surface. Earthquakes, folding, and volcanic eruptions are endogenic processes.

Sand dune

Sand dunes are mounds or ridges of sand deposited by wind, an exogenic process. Gorges are formed by river erosion, moraines by glacial deposition, and deltas by river deposition.

Weathering

Weathering is the in-situ breakdown of rocks and minerals at or near the Earth's surface. Erosion involves the transportation of weathered material, deposition is the settling of that material, and mass wasting is the downslope movement of rock and soil.

Glacier

Glaciers carve U-shaped valleys through glacial erosion. Rivers typically form V-shaped valleys, wind forms features like yardangs, and ocean waves form cliffs and wave-cut platforms.

Deposition by a river

A delta forms when a river deposits sediment as it enters a standing body of water, such as a lake or sea. This is an exogenic process of deposition.

True

Endogenic processes, such as volcanism and diastrophism, are powered by the Earth's internal heat and forces.

False

Weathering is an exogenic process that breaks down rocks at the Earth's surface, driven by external agents like wind, water, and temperature changes.

River erosion

River valleys are typically carved by the erosional action of rivers, a type of exogenic process. Glacial erosion forms U-shaped valleys, wind erosion forms features like yardangs, and coastal erosion shapes cliffs.

Diastrophism

Diastrophism refers to the deformation of the Earth's crust through processes like folding, faulting, and warping, driven by internal (endogenic) forces.

Solar energy

Exogenic processes are powered by solar energy and gravity. The Sun drives weather, wind, and the water cycle, while gravity causes erosion and mass wasting. Internal heat and radioactive decay drive endogenic processes.

Formation of mountains

Mountains are formed by endogenic processes such as folding, faulting, and volcanic activity. Deltas, floodplains, and sand dunes are formed by exogenic processes of deposition.

Wind

In arid regions, wind is a dominant agent of erosion and deposition due to the lack of vegetation and moisture. Glaciers are effective in cold regions, running water in humid areas, and sea waves along coastlines.

Earthquake

Earthquakes are sudden and rapid endogenic events. Continental drift, mountain building, and plate tectonics are slow, gradual endogenic processes.

To wear down the land

Exogenic processes, such as weathering and erosion, wear down and level the Earth's surface. Endogenic processes build up the land, while creating new crust and causing earthquakes are also endogenic.

Folding

Folding is an endogenic process that deforms the Earth's crust. Erosion, deposition, and weathering are all exogenic processes.

Orogenesis (mountain building)

Orogenesis, or mountain building, is a slow endogenic process that takes millions of years. Volcanic eruptions, earthquakes, and tsunamis are sudden endogenic events.

River

A gorge is a deep, narrow valley with steep sides, typically formed by the erosive action of a river. Glaciers form U-shaped valleys, wind forms features like mushroom rocks, and sea waves form cliffs.