3º ESO. UNIT 1: Relief and rivers

HOW THE RELIEF IS TRANSFORMED? 

water - infiltrates - beaches - marine - fragmentation - plants - deserts - soil - solution - accumulation -  limestone -temperature - wind - rivers - currents - dunes


Internal forces form the relief and external forces shape the relief. This transformation involves three types of action:

• Erosion: is the ................................and dissolution of rocks, .................... and mud.
• Transportation: eroded materiels are transported by wind or .................................
• Sedimentation: is the .................................... of sediments such as mud, sand or eroded rocks.

The agents of erosion are: .................................................., water, ........................... and living things.


..................................: Abrupt changes in it can break rocks. It happens in ......................... or mountains where there is a great difference between daytime and ................................... temperatures.


Water:  

• When it ........................ through rocks and freezes, water expands and breaks the rocks. 
• ...............................: is when water dissolves some kinds of rocks, such as .......................... producing caves.
• Fluvial erosion: produced by ...........................
• ................................. erosion: waves and ........................... wear away coast creating cliffs. Sediments transported by the sea water are deposited and form .......................... 

Wind: transports particles of sand or soil from their original place and deposits them. .......................... are formed this way.


Living things: ........................ and animals transform the relief through their activities while human beings make the fastest and more dangerous impact through activities such as farming, mining and deforestation.