There are many courses of the Earth there tensional forces horizontal horizontal forces compressional forces and the internal and external forces

Internal Forces:
Internal forces are the forces that act within the Earth's crust and cause changes in the Earth's surface. These forces are generated by the movement of tectonic plates, which are large pieces of the Earth's crust that float on the semi-fluid mantle below.

1. Plate Tectonics: The Earth's lithosphere is divided into several large and small tectonic plates that constantly move and interact with each other. This movement is driven by convection currents in the mantle. The interaction between these plates leads to various geological processes such as earthquakes, volcanic eruptions, and the formation of mountains.

2. Volcanic Activity: The movement of tectonic plates can result in the formation of volcanoes. When two plates converge, one plate may be forced beneath the other, creating a subduction zone. The subducted plate melts and rises to the surface as magma, which can erupt as lava and form a volcano.

3. Earthquakes: Earthquakes occur when there is a sudden release of energy in the Earth's crust. This energy is generated by the movement of tectonic plates, which can cause rocks to break and slip along fault lines. Earthquakes can result in the formation of new landforms such as fault scarps and rift valleys.

External Forces:
External forces are the forces that act on the Earth's surface and cause changes to the landforms. These forces are primarily driven by weathering and erosion processes.

1. Weathering: Weathering is the process of breaking down rocks into smaller particles by physical, chemical, and biological means. Physical weathering includes processes such as freeze-thaw action, where water seeps into cracks in rocks, freezes, and expands, causing the rock to break apart. Chemical weathering involves the alteration of rock minerals through chemical reactions. Biological weathering is caused by the actions of plants and animals.

2. Erosion: Erosion is the process of transporting weathered material from one place to another. It is primarily carried out by water, wind, and ice. Water erosion occurs through the action of rivers, streams, and waves. Wind erosion occurs when wind picks up and transports loose particles, leading to the formation of features such as sand dunes. Glacial erosion occurs when glaciers move and carry away large amounts of sediment.

3. Deposition: Deposition is the process of laying down sediment that has been eroded and transported by external forces. Deposition occurs when the energy of the transporting agent decreases, causing it to drop the sediment it was carrying. This can result in the formation of landforms such as deltas, beaches, and alluvial plains.

In summary, internal forces are generated by the movement of tectonic plates and result in geological processes such as volcanism and earthquakes. External forces, on the other hand, are driven by weathering and erosion processes and cause changes to the Earth's surface through processes such as erosion and deposition.