5th Grade Science
Chapter 1: Lesson 1 - pp. C4 - C11
Erosion, Deposition and Weathering
Erosion - the process that picks up sediment and move it around
Deposition - the process that leaves sediment in a different place
Forces that cause erosion and deposition - water, wind, glaciers, gravity and forces within the Earth such as an earthquake. Erosion and deposition can change landforms or make new ones
Weathering is needed to break down the rock of the Earth’s surface into soil, which is used for growth by most plants.
Four Agents Which Cause Landforms to Change
Wind can blow sand into large mounds called dunes
Ice in the form of glaciers can also change land forms. There are two types of glaciers: Valley glaciers found in high mountains and continental glaciers that are large sheets of ice that cover large areas of the Earth.
Mass movement is the downhill movement of rock and soil because of gravity. Mudslides and landslides are examples of mass movement. Creep is another type of mass movement. Creep is when soil moves slowly downhill because of gravity. A sinkhole is a large hole in the ground which opens up suddenly.
Gravity - pulls soil/ice downhill