Geomorphic Processes

Sediment consists of solid material, such as minerals and organic debris, that is transported and deposited by water or wind. Soil and rocks are broader terms, and the Mekong is a river.

While silt is sometimes described as fine sand, it is actually fine granular material between sand and clay in size. It is composed of mineral particles that are larger than clay but smaller than sand, commonly found in river deposits and fertile soil.

Dikes are typically used to control or prevent flooding by holding back water, not to direct the flow of sand. They are barriers against water, not sand management tools.

A delta is a landform created by the deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water.

In the hydrologic cycle, transport refers to the movement of water from one location to another, such as through atmospheric currents or surface runoff.

Mineralization is the process where organic material is replaced by minerals, turning it into a fossil. Sedimentation is the deposition of material, but not the specific process of turning into stone.

A geologic era is a large span of time in the geologic time scale, typically characterized by major changes in life forms and sediment deposition.

Erosion is minimized when the ground is flat and covered by vegetation. Vegetation roots anchor the soil, while flat terrain reduces the speed of water runoff.

The Himalaya were formed by the collision of the Indian tectonic plate with the Eurasian plate, a process known as plate tectonics.

A delta is a landform created by the deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving water.

An alluvial plain is a flat area of land next to a river, formed by the deposition of sediment (alluvium) carried by the river during flooding.

A delta is a landform created at the mouth of a river where the flow slows down and deposits the sediment it has been carrying.

Outwash plains are broad, flat areas formed by sediment deposited by meltwater streams flowing from the front of a glacier. Moraines are ridges of unsorted debris deposited directly by glacial ice, not by meltwater.

Moraines are accumulations of dirt and rocks that have been pushed along by a glacier as it moves. They are essentially the debris left behind when the ice melts or retreats.

Glacial erratics are large boulders that differ in composition from the local bedrock, having been transported and deposited by a glacier. They are left behind when the ice melts.