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The Rock Cycle and the three types of Rocks

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Ajahnea Garrison

on 23 May 2013

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Transcript of The Rock Cycle and the three types of Rocks

The Rock Cycle &
The three major
rocks!!! By: Ajahnea Garrison Pr: 8 Rock Cycle: The Rock Cycle is a process in which rocks are formed, changed by weathering , erosion etc.. destroyed then created. Defintion of The Rock Cycle What are the 3 types of rocks? The 3 types of rocks are Igneous Sedimentary and Metamorphic. In the next slides there will a futher explanation of these rocks and other definitons :) Igneous Rocks What is a igneous rock? Whats the definition ? How is it formed? Igneous Rock: a rock that forms by the cooling and solidifying of
molten materials.

Also igneous rocks can be intrusive or extrusive. Examples!!! Some examples of igneous rocks are:pumice
basalt , andesite, wehrlite and monzonite Intrusive and Extrusive Intrusive: rocks are solidified
from magma
under the surface resulting
in a visible crystalline texture, Extrusive: igneous rocks are solidified
from lava at or near the surface, resulting in a small or nearly invisible crystalline texture Pictures!!!!!! Sedimentary Rocks Sedimentary Rock: Rock formed through the deposition and solidification of sediment. What is Sediment? Sediment: Mineral or organic matter deposited by water, air, or ice. Sedimentary Rocks are usally in layer and contain fossils. Examples w/ Pics!!!! Shale Sandstone Limestone
Siltstone Mudstone Chalk and
Claystone are all examples. And Last But Not least........ Metamorphic Rock!!! Metamorphic: Rock that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase. How does Metamorphic Rock form? What are some examples? Where does it form? Metamorphic Rocks form beneath the earth under immense heat and pressure.

Some examples are Marble,Slate, Quartzite and Gneiss. Pictures! Learning Objectives:

1. What are intrusive rocks?

2. What are 2 examples of metamorphic rocks?

3. What is Chemical Weathering? Andesite
Wehrlite Siltstone Claystone Gneiss Quartzite Thats it for the rock cycle the 3 types of rocks now we go onto learning the ways rock changes. Weathering One of the ways that Rocks change there form is by weathering. What is Weathering?? Weathring: The various mechanical and chemical processes that cause exposed rock to decompose. Chemical and Mechanical Weathering When dealing with weathering there are two types Chemical and Mechanical.

Chemical Weathring: Caused exposed rock to undergo chemical decomposition, changing the chemical and mineralogical composition of the rock Example: Acids and Oxygen

Mechanical Weathering: Physical disintegration of exposed rock without any change in the chemical composition of the rock. Example: A collision between rock sufaces. Chemical Weathering Mechanical
Weathering Erosion Erosion:The gradual wearing away of rock or soil by physical breakdown, chemical solution, & transportation of material, as caused by water, wind, or ice Erosion Example Compacting That's It Xp Game Time!!!!!!!!! http://www.learner.org/interactives/rockcycle/diagram2.html Compacting: Tighter packing of sedimentary grains causing weak lithification (the consolidation of a loosely deposited sediment into a hard sedimentary rock) and a decrease in porosity(permeable by water, air, etc.) usually from the weight of overlying sediment. Cementing Cementation- The process by which clastic (broken pieces of older rocks) sediment is lithified by precipitation of mineral cement, such as calcite cement, among the grains of the sediment. Compaction Cementing
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