Endogenic and exogenic forces

The direct answer is Option A, changes in landforms. Geomorphic processes are natural processes that create, destroy, reshape or move parts of the Earth’s surface. They include endogenic actions such as folding, faulting, uplift and earthquakes, and exogenic actions such as weathering, erosion and deposition. Together these processes produce features such as mountains, valleys, plains, dunes and river terraces. Option B is wrong because geomorphic processes are not limited to seawater; rivers, wind, ice, groundwater and internal forces also act. Option C is wrong because atmospheric pressure alone is only one possible environmental factor and does not define the whole field. Option D is wrong because plant growth can influence weathering, but it is not the main subject or sole cause of geomorphic change. Option A is correct because it states the broad result: modification of landforms. The word “geo” refers to Earth and “morphic” refers to form, so geomorphic means related to Earth’s surface forms. Exam cue: connect geomorphic processes with the making and changing of landforms.

Exogenic processes are mainly driven by solar energy and gravity. Exam tip: link external energy with the Sun.

The direct answer is Option A, earthquake. An endogenic force is generated inside the Earth by internal heat, pressure and movements of the crust or plates. An earthquake occurs when stored stress is released suddenly, so it is a clear example of an internal or endogenic force. Option B, weathering, is the breaking down of rocks at the surface through water, temperature changes, chemicals or organisms; it is exogenic. Option C, erosion, means removal and transport of weathered material by water, wind, ice or waves; it operates at or near the surface and is exogenic. Option D, deposition, is the settling of transported sediment when an agent loses energy; it too is exogenic. Thus A is correct because its cause is internal, while B, C and D are surface processes. The question asks for a force or process, but the classification remains clear: earthquakes result from internal tectonic stress. Do not confuse “visible at the surface” with “originating at the surface.” Memory trick: earthquake begins inside; weathering, erosion and deposition act outside.

Endogenic forces can create structures like mountains and plateaus. Exam tip: remember them as constructive forces.

Exogenic forces erode high areas and deposit material in low areas. Exam tip: connect them with leveling.

Volcanic activity is related to internal heat and magma. Exam tip: connect volcanoes with internal energy.

In weathering, rocks break or decay in place. Exam tip: remember weathering as an external process.

Endogenic forces get energy from inside and exogenic forces from outside. Exam tip: identify the source first.

In erosion, water, wind, or glaciers remove material. Exam tip: identify erosion from cutting and removal.

In deposition, transported material gets accumulated at a place. Exam tip: identify deposition from accumulation.

Crustal uplift is linked with internal earth movements. Exam tip: connect uplift with endogenic forces.

A river forms a valley by erosion as an external agent. Exam tip: treat river work as an exogenic process.

Mountain building is linked with internal tectonic movements. Exam tip: connect mountain building with internal forces.

Gravity helps material move from higher to lower slopes. Exam tip: connect slope movement with gravity.

Water, wind, and glaciers work as external agents. Exam tip: connect them with erosion and deposition.

Tectonic movement is linked with plates and internal forces. Exam tip: consider tectonics as endogenic.

Weathering breaks rocks in place and does not necessarily transport material. Exam tip: breaking in place means weathering.

Erosion removes and deposition accumulates material. Exam tip: understand both as parts of the exogenic sequence.

The Earth's internal heat is a major cause of endogenic movements. Exam tip: connect internal heat with endogenic energy.

Exogenic processes act on the surface under weather, water, and wind. Exam tip: identify exogenic processes from the word surface.

Mountains can form due to internal earth movements. Exam tip: connect mountains with constructive endogenic forces.

A delta forms by deposition of material brought by a river. Exam tip: connect delta with river deposition.

Both are linked with internal energy and movements of the Earth. Exam tip: remember earthquakes and volcanoes together.

Weathering weakens rocks by breaking or decomposing them. Exam tip: connect rock weakening with weathering.

In the exogenic sequence, material moves after weathering through transportation. Exam tip: identify transportation from carrying.