Endogenic and exogenic forces

Temperature and weather changes affect weathering. Exam tip: connect solar energy with exogenic actions.

Exogenic forces wear down high areas and balance the surface. Exam tip: connect wearing down with exogenic forces.

An earthquake is a sudden endogenic event caused by tectonic activity within the Earth. In contrast, river deposition, wind transportation of sand, and chemical weathering are exogenic processes that generally modify landforms gradually. Exam tip: remember earthquakes and volcanic eruptions as sudden events produced by internal forces.

Weathering is a slow exogenic process in which rocks break down or decompose in place because of temperature changes, water, air, and living organisms. Earthquakes, volcanic eruptions, and crustal folding are endogenic processes caused by forces within the Earth. Exam tip: slow physical or chemical breakdown of rocks at the surface indicates weathering.

Plate movement is influenced by internal energy and convection. Exam tip: consider plate movement endogenic.

Deposition is the accumulation of sediments by a river. Exam tip: connect deltas near the sea with this process.

The energy of endogenic forces comes from the interior. Exam tip: use origin from within as the main clue.

Exogenic forces are linked with water, wind, glaciers, and gravity on the surface. Exam tip: identify surface action as exogenic.

When a river cuts and carries material away, it is erosion. Exam tip: look for both cutting and carrying clues.

When wind deposits sand, a sand dune forms. Exam tip: identify deposition from wind and accumulation.

Faulting may involve cracks and displacement in the crust. Exam tip: connect crustal cracks with endogenic movement.

Folding is linked with bending of rock layers due to internal pressure. Exam tip: treat bending of layers as endogenic.

Gravity moves material downslope. Exam tip: consider gravity as a helper of external surface processes.

This shows the leveling tendency of exogenic forces. Exam tip: when cutting and filling occur together, write leveling.

Sudden shaking of the ground is the main indication of an earthquake. An earthquake is an endogenic process caused by the sudden release of energy or movement of rocks within the Earth. River deposition, wind erosion, and chemical weathering are generally gradual exogenic processes and do not cause the land to shake suddenly. Exam tip: words such as “sudden shaking” or “ground trembling” point to an earthquake.

Magma comes from within the Earth, so it is linked with endogenic force. Exam tip: identify magma with volcanic endogenic processes.

The direct answer is Option A, exogenic process. A glacier is a mass of moving ice on the Earth’s surface. As it flows, embedded rocks and rock fragments scrape, grind and wear the valley floor and sides. This work is glacial erosion, a surface process caused by an external agent, so it is exogenic. Option B is wrong because endogenic processes originate inside the Earth, such as earthquakes, folding and volcanic activity; a glacier acts at the surface. Option C is wrong because the question describes rubbing by ice, not the eruption or movement of magma. Option D is wrong because seismic processes involve earthquakes and vibrations caused by internal stress, not the mechanical action of moving ice. The important distinction is between source and effect: the glacier may strongly reshape mountains, but its energy and action are external to the Earth’s interior. Other exogenic agents include rivers, wind, waves and groundwater. Exam cue: if water, wind, ice or waves wear the surface, select exogenic. Memory trick: “ice cuts outside; earthquakes move inside.”

Construction and denudation operate together on the surface. Exam tip: understand balance through building and leveling.

Exogenic forces can erode material and deposit it in lower areas. Exam tip: connect low areas with deposition.

Energy drives both internal and external processes. Exam tip: use energy source to identify the process.

The direct answer is A: soil being washed away by rainwater. An exogenic force works at or near the surface and is driven by agents such as running water, wind, ice, waves and gravity. When rain falls, flowing water can loosen soil particles, carry them downslope and deposit them elsewhere. This is surface erosion, so option A is the clearest example. Option B, crustal uplift from inside, is an endogenic tectonic process because internal forces raise the crust. Option C, magma rising, is also internal and connected with igneous or volcanic activity. Option D, plates moving at depth, is a tectonic process caused by forces within Earth, not a direct surface erosion process. The distinction is not simply whether movement occurs; it is where the force acts and what agent performs the work. Rainwater acts on the surface and removes material. Exam cue: water washing soil, wind carrying dust and glaciers cutting valleys are exogenic examples.

The simplest difference lies in the source of energy and action. Exam tip: choose the answer by noticing inside and outside clues.

Geomorphic processes continuously form and modify the Earth's surface. Exam tip: remember both construction and destruction together.

Breaking and carrying of rocks are linked with weathering and erosion. Exam tip: treat surface breakdown and transport as exogenic.

An endogenic force is identified by energy from inside the Earth. Exam tip: take the word inside as the main clue.