new homework reward! for completing your homework and being at school every day of a week, you will...
TRANSCRIPT
New Homework Reward!New Homework Reward!
For completing your homework and being For completing your homework and being at school every day of a week, you will at school every day of a week, you will get a certificateget a certificate
You will also get to put a sticker up on You will also get to put a sticker up on the back wallthe back wall
4 stickers = free homework pass4 stickers = free homework pass Whole class gets to 10 stickers = free Whole class gets to 10 stickers = free
hour of class!hour of class!
ROCKSROCKS
Brian MadisonBrian Madison: You remember that : You remember that spelling bee you won in the 1st grade? spelling bee you won in the 1st grade? Billy MadisonBilly Madison: Oh no, you didn't. : Oh no, you didn't. Brian MadisonBrian Madison: Rock? "r-o-k"? : Rock? "r-o-k"? Billy MadisonBilly Madison: Yea, so what's your point? : Yea, so what's your point? Brian MadisonBrian Madison: r-o-C-k! : r-o-C-k! Billy MadisonBilly Madison: Ohh! The "C" is silent. : Ohh! The "C" is silent.
IGNEOUS ROCKS:IGNEOUS ROCKS:forms when magma coolsforms when magma coolscrystals form during coolingcrystals form during cooling
IntrusiveIntrusive
Magma cools SLOWLY below Earth’s Magma cools SLOWLY below Earth’s SurfaceSurface
LARGE visible crystalsLARGE visible crystals Large crystals have time to form because Large crystals have time to form because
the cooling process is slow because it is the cooling process is slow because it is very warm closer to the mantlevery warm closer to the mantle
Where would intrusive Where would intrusive igneous rock likely be igneous rock likely be found?found?
Inside or below a volcanoInside or below a volcano In the mantleIn the mantle
ExtrusiveExtrusive
Magma cools RAPIDLY above Earth’s Magma cools RAPIDLY above Earth’s surfacesurface
Has SMALL microscopic crystalsHas SMALL microscopic crystals Crystals do not have time to form (because Crystals do not have time to form (because
cooling happens very quickly) so they’re cooling happens very quickly) so they’re very smallvery small
Where would extrusive Where would extrusive igneous rock likely be igneous rock likely be found?found?
Outside of a volcanoOutside of a volcano In ridges!In ridges!
SEDIMENTARY ROCKSSEDIMENTARY ROCKS
Form when old Form when old pieces of rocks pieces of rocks have been have been weathered and weathered and combined to combined to make a new make a new rockrock
Sedimentary RocksSedimentary Rocks
Formed via 4 step process:Formed via 4 step process: 1. Weathering—wind, rain, and chemicals 1. Weathering—wind, rain, and chemicals
decompose the rocksdecompose the rocks 2. Erosion—Pieces of rock moved by wind or water2. Erosion—Pieces of rock moved by wind or water 3. Deposition—Pieces dropped in new location3. Deposition—Pieces dropped in new location 4. Sedimentation—Pieces compressed and 4. Sedimentation—Pieces compressed and
cemented togethercemented together
So, sedimentary rocks are formed where So, sedimentary rocks are formed where weathering occurs!weathering occurs! On the surface of the earth and near waterOn the surface of the earth and near water
Sedimentary Rocks: Sedimentary Rocks: Imp PointImp Point
As sediments continue to stack on top of As sediments continue to stack on top of each other, LAYERS will be formed in the each other, LAYERS will be formed in the rockrock
Therefore, sedimentary rocks contained Therefore, sedimentary rocks contained LAYERS called strataLAYERS called strata
Layers of Sedimentary RockLayers of Sedimentary Rock The layers that were deposited first will be on The layers that were deposited first will be on
the bottom.the bottom. So, So, oldest layers of rock are on the bottom oldest layers of rock are on the bottom
and the newest layers of rock are on the topand the newest layers of rock are on the top Layers of rock can be dated and can tell us a Layers of rock can be dated and can tell us a
lot of information about the conditions and the lot of information about the conditions and the species the lived when that rock was depositedspecies the lived when that rock was deposited Fossils are often found in layers of sedimentary rockFossils are often found in layers of sedimentary rock
This picture shows layers of rock on earth. You can see that the deepest layers contain the oldest fossils
Which layer Which layer here is the here is the oldest? The oldest? The newest?newest?
Answer:Answer: Kaibab Kaibab
Formation is Formation is oldestoldest
Dakota Dakota Formation is Formation is newestnewest
Metamorphic RocksMetamorphic Rocks
Created when other rocks (sedimentary Created when other rocks (sedimentary or igneous) are or igneous) are changedchanged by heat and by heat and pressurepressure
Found at / near subduction zones Found at / near subduction zones because this is where crust (rock) is because this is where crust (rock) is pushed downward to areas of heat and pushed downward to areas of heat and pressure!pressure!