1. Erosion: Erosion is the process of wearing away and transporting soil and rock. It can be caused by a variety of factors, including:

* Water: Rain, rivers, and ocean waves can all erode land. Rain can carry away topsoil, while rivers carve out canyons and valleys. Ocean waves can wear down coastlines, creating cliffs and beaches.

* Wind: Wind can pick up loose soil and sand and carry it away, creating sand dunes and deserts.

* Ice: Glaciers can carve out valleys, create lakes, and transport large amounts of rock and sediment.

* Gravity: Gravity can cause landslides and rockfalls, dramatically altering the landscape.

2. Tectonic Plate Movement: The Earth's crust is made up of large plates that are constantly moving. These movements can cause a variety of landforms, including:

* Mountains: When two plates collide, the land can be pushed up to form mountains.

* Volcanoes: When magma from the Earth's mantle rises to the surface, it can erupt to form volcanoes.

* Earthquakes: The movement of tectonic plates can cause earthquakes, which can shake the ground and cause landslides and tsunamis.

These two forces, erosion and tectonic plate movement, constantly shape and reshape the Earth's surface, creating the diverse landscapes we see today.