Endogenic and exogenic forces

Earthquakes result from sudden release of stress stored inside the earth. In exams identify the source of energy first.

Exogenic processes are driven by weather systems from solar energy and by gravity. In exams link external energy with the sun and gravity.

Earthquake and volcanism both arise from energy within the earth. In exams forces originating inside the earth are endogenic.

Weathering and erosion occur on the earth surface through external agents. In exams breaking and removal of surface material are exogenic processes.

Endogenic uplift creates steep slopes and exogenic gravity makes them unstable. In exams landslide is a gravitational exogenic process.

Both folding and faulting deform rocks due to internal stresses. In exams connect structural landforms with endogenic processes.

Exogenic forces remove material from higher places and deposit it in lower places. In exams this can be called a tendency toward leveling.

Endogenic forces may cause slow changes like mountain building and sudden ones like earthquakes. In exams note that their rate can vary.

Steep slope heavy rainfall and weak rocks increase erosion and landslides. In exams consider climate rock type and slope as controls of exogenic rate.

Magma comes from inside the earth so volcanic landforms are endogenic. In exams focus on the depth of origin.

Mountain building and its degradation together produce real landforms. In exams distinguish formation from modification.

Exogenic processes directly act on rock soil and water at the surface. In exams link surface factors with external forces.

When uplift stops external erosion lowers height and slope. In exams think how landform tendency changes when energy balance changes.

Endogenic forces are linked with internal heat and structural readjustment of the earth. In exams internal energy is the key clue.

The mountain may be endogenic but valley cutting by a river is exogenic modification. In exams separate origin from later change.

At plate boundaries compression tension and magma activity increase endogenic events. In exams treat plate boundaries as endogenically active zones.

River erosion occurs at the surface through water and gravity. In exams treat water wind ice and waves as exogenic agents.

If slope water or stress crosses a limit landslide or erosion may suddenly increase. In exams understand threshold as a critical process limit.

The correct answer is B. The key test is to identify where the process acts and what drives it. Exogenic processes work at or near the surface and use external agents such as running water, wind, glaciers, atmospheric gases, or temperature changes. These agents can weather rock, erode it, transport fragments, and deposit them elsewhere. A is an endogenic clue because internal heat originates inside Earth. C is endogenic because rising magma comes from internal molten material. D is endogenic because plate stress is a tectonic force generated within the Earth system. A surface effect alone does not prove that a process is exogenic; its energy source and agent must also be considered. Memory cue: outside agents shape the outside surface.

Isostatic adjustment relates to deep density and load balance. In exams deep earth balance should be read as endogenic.

Tectonic uplift raises relief while river erosion cuts it down. In exams distinguish relief creation from relief reduction.

Weathering breaks or alters rock in place while erosion removes material. In exams use transport as the key difference.

Resistant rock and limited water reduce the rate of erosion. In exams consider rock type and water availability as rate controls.

Rivers and weathering can cut plateaus into dissected forms. In exams call the later change of plateaus exogenic modification.

Chemical weathering alters rocks in place without immediate removal. In exams it is an example of exogenic weathering.