What is the definition of abrasion? The wearing down of rocks by wind, water, and other rocks.

 When natural forces move weathered rock from one location to another

 The laying down of sediment in a new location.

As the river slows down, larger particles of rock will deposit first.

 It becomes smaller and smoother around the edges.

 After a disruption to an ecosystem, one species of plants of animals replaces another species until a climax community is reached.  2 types- primary starts with no soil: volcano eruption, landslide  Secondary starts with soil: farmland, vacant lot.

 The first species that grow back in primary succession because they don’t need soil. Lichen and Moss

 A stable community that no longer goes through major ecological change

 Liquid water and carbon

 It is built by humans and orbits another object.

 Not enough tech to shield our spacecraft from radiation, can’t carry enough water to drink and produce oxygen for long deep space trips.

 A CE is something that happens that affects a large number of people and does a great deal of damage to the environment and manmade structures  A disaster is a state of extreme ruin and misfortune

 By the movement of tectonic plates

 Magma rises through cracks or weaknesses in the Earth's crust. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption.

 A tsunami is a series of enormous waves created by an underwater disturbance usually associated with earthquakes occurring below or near the ocean

 Tiny air spaces in between particles of rock that allow water to pass through. The bigger the spaces = the more permeability

 Groundwater- rain that soaks into the soil, pores of rocks and cracks in the earths surface  Surface water- the water that fills lakes and rivers

 Watershed- an area of the land where all runoff drains to the same body of water (stream, river, ocean, etc.)  Divide- A ridge or other topographic feature that separates two adjacent drainage basins. It is an imaginary line that separates two different directions of surface water flow.  Riffle- a shallow part of a stream that flows over uneven ground- oxygenates the water

 Glaciers

 Pollution, large amounts of fertilizer, drilling for water wells

 Flyby, lander, orbiter  Flyby Orbiter Lander