Post on 10-Feb-2016
description
Rocks and Soil
Rocks• ROCKS• The rocks you see around you - the mountains,
canyons & riverbeds, are all made of minerals. A rock is made up of 2 or more minerals. Think of a chocolate chip cookie as a rock. The cookie is made of flour, butter, sugar & chocolate. The cookie is like a rock and the flour, butter, sugar & chocolate are like minerals. You need minerals to make rocks, but you don't need rocks to make minerals. All rocks are made of minerals.
Rocks• Properties of Rocks (how we
categorize them)• Texture • Layering• Color
Texture•How smooth or rough they are
• http://www.classzone.com/books/earth_science/terc/content/investigations/es0603/es0603page02.cfm
Layering• http://
www.classzone.com/books/earth_science/terc/content/investigations/es0610/es0610page04.cfm
3 types of rocks• Igneous Rocks
• Metamorphic Rocks
• Sedimentary Rocks
Igneous Rocks
•Igneous rocks form directly from the cooling of magma.
• http://www.fi.edu/fellows/fellow1/oct98/create/igneous.htm
Metamorphic Rocks
• The metamorphic rock gets the name from "meta" (change) and "morph" (form).
• The rock is moved into an environment in which the minerals which make up the rock become unstable. In most cases, this involves burial which leads to a rise in temperature and pressure.
• http://www.fi.edu/fellows/fellow1/oct98/create/metamorph.htm
Sedimentary Rocks
• In most places on the surface, the igneous rocks which make up the majority of the crust are covered by a thin layer of loose sediment, and the rock which is made as layers of this debris get compacted and cemented together.
• http://www.fi.edu/fellows/fellow1/oct98/create/sediment.htm
Rock Cycle• http://www.classzone.com/books/earth_sci
ence/terc/content/investigations/es0602/es0602page02.cfm
Smaller rocks come from the breakdown
of larger rocks through the action
of plants and weathering
Soil
Composition• Soil is made of:
–Small rocks–Decomposed pieces of plants and animals•Dead plants•Dead animals
–Products of plants and animals•Animal waste
Properties of Soil• Color
– Is it dark or light?• Capacity to retain water
–Does it hold a lot of water?• Capacity to grow plants
–Does the soil have nutrients like nitrogen to help plants grow well?
• Texture–How does it feel?
Kind of soil
How it feels Hold shape when wet
Sandy Feels gritty Won’t stick together when wet
Silty Feels powdery
Will stick together when wet but will not hold together after it dries
Clay Feels sticky Stays together when wet
Which is clay? Which is sand?
• Soil is also found in layers like rocks, with topsoil on top.
• Each layer is
called a horizon
• http://www.classzone.com/books/earth_science/terc/content/investigations/es1206/es1206page02.cfm?chapter_no=investigation