<strong>Erosion and Weathering</strong>

Weathering- the breaking away of soil
<ul>
	<li>Chemical weathering- breaking down with the use of chemicals</li>
	<li>Mechanical weathering- broken down by manmade things or people</li>
</ul>
Erosion- The movement of soil and rock by wind or water

<strong>Soil Formation</strong>

Soil has layers

Horizon A-Topsoil, humus, some organix material dark in color

Horizon B- Subsoil, a little ligher in color

Horizon C-subsoil- even lighter in color chunks of broken rock

<strong>ROCK VS MINERALS</strong>

Rocks are made of minerals

<em>Minerals are defined by their properties</em> (characteristics)

1) Luster: metallic shine or nonmetallic shine

2)Streak: when rubbed against something what color or type of mark it leaves behind

3)Hardness: how hard is it according to the Moh's scale of hardness

<strong>ROCK CYCLE</strong>

<img class="alignleft size-full wp-image-41" src="http://aljohnson14.cuipblogs.net/files/2009/10/EFCycleP21.gif" alt="EFCycleP2" width="393" height="350" />

 

 

 

 

 

 

 

 

 

 

<strong>ERAs</strong>

<strong>1.</strong>Paleozoic- "Old life" occured 575-251 mya

2. Mesozoic-"middle life" occured 251- to  65mys

age of the dinosaurs

3.Cenozoic-"new life" occured 65mya to now

rise of the mammels