science station metamorphic and sedimentary rocks
TRANSCRIPT
Science Station
Metamorphic and Sedimentary Rocks
WelcomeWelcome to
today’s lesson. Today we will
review Igneous Rocks and learn
about Metamorphic and
Sedimentary Rocks.
Rock Review
During our last lesson, we learned that there are three different types of rock:
1.Igneous Rock
2.Metamorphic Rock
3.Sedimentary Rock
Rock Review
We also learned that rocks go through a rock cycle just like plants and humans.
Rock Review
Finally, we discussed one particular type of rock, Igneous Rocks. Igneous Rocks are created when molten lava cools and hardens. When a volcano erupts you would see lava pouring out of the top of the volcano. This lava would eventually cool down and turn into a hard rock, Igneous Rock.
Rock ReviewYou can also find
Igneous Rock under the ground, in Earth’s mantel. When lava is still underground it is called magma. When magma
cools it also turns into Igneous Rock.
Metamorphic Rocks
“Metamorphic rocks are rocks that have changed. The word comes from the Greek "meta" and "morph" which means to change form. Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth's crust, were changed.”
Metamorphic Rocks
“If you squeeze your hands together very hard, you will feel heat and pressure. When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change. Marble is an example of a sedimentary rock that has been changed into a metamorphic rock.”
Metamorphic Rocks
“Metamorphic rocks are the least common of the 3 kinds of rocks. Metamorphic rocks were igneous or sedimentary rocks that have been transformed by great heat or pressure.”
Metamorphic Rocks
“Foliated metamorphic rocks have layers, or
banding. Slate is transformed
shale. It splits into smooth slabs.”
Metamorphic Rocks
“Schist is the most common metamorphic rock. Mica is
the most common mineral.”
Metamorphic Rocks
“Gneiss has a streaky
look because of alternating
layers of minerals.”
Metamorphic Rocks
“Non-foliated metamorphic rocks are not
layered. Marble is
transformed limestone.”
Metamorphic Rocks
“Quartzite is very hard.”
Information from:
http://www.rocksforkids.com/RFK/howrocks.html#Metamorphic
Metamorphic Rocks
You don’t need to recognize the
different types of metamorphic
rocks. I just want you to see the different types!
Sedimentary Rocks
“When mountains are first formed, they are tall and jagged like the Rocky Mountains on the west coast of North America. Over a long time mountains become old mountains like the Appalachian Mountains on the east coast of Canada and the United States.”
Sedimentary Rocks
“When mountains are old, they are rounded and much lower. A lot of rock gets worn away due to erosion. Rain, freeze/thaw cycle, wind and running water cause the big mountains to crumble a little bit at a time, i.e. EROSION.”
Sedimentary Rocks
New – Rocky Mountains
Old – Appalachian Mountains
Sedimentary Rocks“Eventually most of
the broken bits of the rock end up in the
streams & rivers that flow down from the
mountains. These little bits of rock & sand are
called sediments.”
Sedimentary Rocks
“When the water slows down enough,
these sediments settle to the bottom of the lake or oceans. Over many years, layers of different
rock pieces settle at the bottom of lakes
and oceans.”
Sedimentary Rocks
“Think of each layer as a page in a book. One piece of paper is not heavy. But a stack of telephone books is very heavy & would squish anything that was underneath. Over time the layers of sand and mud at the bottom of lakes & oceans turned into rocks. These are called sedimentary rocks.”
Sedimentary Rocks
Sedimentary Rocks
Some examples of sedimentary
rocks are sandstone and shale.
Sedimentary Rocks
“Sedimentary rocks often have fossils in them. Fossils are plants and animals that have died and got covered up by new layers of sediment and are turned into stone. Most of the fossils we find are of plants & animals that lived in the sea. They just settled to the bottom.”
Sedimentary Rocks
“Sedimentary rocks cover 75% of the earth’s surface. Most of the rocks found on the Earth’s surface is sedimentary even though sedimentary rocks only make up less than 5% of all the rocks that make up Earth.”
Information from: http://www.rocksforkids.com/RFK/howrocks.html#Sedimentary
Great work today learning about
Metamorphic and Sedimentary
Rocks. During our next lesson we will review the 3 types
of rocks!
Next Time