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ROCK CYCLES. The Rock Cycle. The Rock Cycle. Rocks are always changing and moving throughout the different phases of the rock cycle. Introduction. Lesson. Quiz. Igneous Rocks. The Rock Cycle. Igneous Rocks. Introduction. Lesson. Quiz. Igneous Rocks. - PowerPoint PPT Presentation
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ROCK CYCLES
The Rock Cycle
Introduction
Lesson
Quiz
The Rock Cycle Rocks are always changing and moving throughout the different phases of the rock cycle.
Igneous Rocks The Rock Cycle
Igneous Rocks
Introduction
Lesson
Quiz
Igneous Rocks
o Igneous Rocks are formed when molten magma becomes solid. o Molten- meltedo Magma on the surface of the Earth is called
lava
o There are two kinds of igneous rocks:o Intrusive Igneous Rocks- magma becomes
solid underground.o Extrusive Igneous Rocks-lava cools and
becomes a solid on Earth’s surface.
Introduction
Lesson
Quiz
Igneous Rocks
o Intrusive Igneous Rocks have large grains and may be various colors. o Examples: granite, gabbro
o Extrusive Igneous Rocks have small grains and also, may be various colors.o Examples: basalt, pumice
Introduction
Lesson
Quiz
Sedimentary Rocks
The Rock Cycle
Sedimentary Rocks
Introduction
Lesson
Quiz
Sedimentary Rocks
o Sedimentary Rocks are layered rocks formed from fragments and broken bits of rock.o These bits of broken rock are a
result of weathering and erosion.o The fragments of rock eventually
cement and compact together to form a layered rock.
Introduction
Lesson
Quiz
Sedimentary Rocks
o The size and texture of sedimentary rocks depend on what kind of fragments make up the rock.o Sedimentary Rocks can be made
of sand, gravel, broken seashells, or even just layers of mud.
Introduction
Lesson
Quiz
Metamorphic RocksThe Rock Cycle
Metamorphic Rocks
Introduction
Lesson
Quiz
Metamorphic Rocks
o When the sedimentary or igneous rocks are pushed down into the ground, they will be under greater pressure and heat.
o This will cause the crystals of the sedimentary rocks to change and become a new kind of rock, called metamorphic rock.
o There are two kinds of metamorphic rocks:o Contact Metamorphic Rocks- forms when
magma inside the Earth comes up into an already existing rock and “bakes” it.
o Regional Metamorphic Rocks- forms when rocks already deep inside the Earth change because of heat and pressure
Introduction
Lesson
Quiz
Metamorphic Rocks
o Metamorphic Rocks may be foliated or nonfoliated:o Foliated means that the rocks
have recognizable parallel bands.o Example: slate, schist
o Nonfoliated means that the rocks do not have these bands; they appear smooth.o Example: quartzite, marble
Introduction
Lesson
Quiz
Are you ready for a quiz?
Introduction
Lesson
Quiz
Yes
No. I need to review the material.
Quiz
Question #1. Which kinds of rocks are formed from molten lava?
Introduction
Lesson
Quiz
Sedimentary Rocks
Metamorphic Rocks
Igneous Rocks
Quiz
Correct!
Igneous Rocks are formed from either molten magma inside the Earth, or molten lava outside the Earth.
Introduction
Lesson
Quiz
Quiz
Question #2. What causes metamorphic rocks to form?
Introduction
Lesson
Quiz
Heat and Weather
Heat and Pressure
Climate and Pressure
Quiz
Correct!
The pressure from rocks above will push the metamorphic rock farther down, where it will be exposed to greater heat. This combination of heat and pressure will cause the crystals in the rock to change and become a new rock: metamorphic rock.
Introduction
Lesson
Quiz
Quiz
Question #3. Bits and pieces of rock form sedimentary rocks? Where do these fragments of rock come from?
Introduction
Lesson
Quiz
Weathering and Erosion
The underlying molten magma
Quiz
Correct!
Weathering occurs first; wind, water, etc. cause bits and pieces of rock to break off. Then erosion occurs when these fragments are carried away and deposited somewhere else.
Introduction
Lesson
Quiz
Quiz
Question #4. What kind of igneous rocks form underground?
Introduction
Lesson
Quiz Intrusive Igneous Rocks
Extrusive Igneous Rocks
Cemented Igneous Rocks
Quiz
Correct!
Intrusive Igneous Rocks are formed from molten magma becoming solid underneath the Earth’s surface.
Introduction
Lesson
Quiz
Quiz
Question #5. ___________forms when magma inside the Earth comes up and “bakes” the nearby rocks.
Introduction
Lesson
Quiz
Contact Metamorphism
Regional Metamorphism
Local Metamorphism
Quiz
Correct!
Contact Metamorphism occurs when magma comes up into another rock and bakes the nearby rocks.
Introduction
Lesson
Quiz
Quiz
Question #6. Are rocks always changing and moving throughout the different phases of the rock cycle?
Introduction
Lesson
Quiz
Yes.
No.
Quiz Correct!
The Rock Cycle is a never-ending process. For example:o An extrusive igneous rock is exposed to weathering.o A channel of water carries this weather igneous rock down a
slope into a lake.o Layers of weathered igneous rock build up in the lake and
eventually are cemented together. o Layer after layer forms on top of the igneous rock and it
becomes a layered sedimentary rock.o After much time, this sedimentary rock is pushed down into
the Earth and becomes exposed to heat.o This heat and pressure cause the grains of the rock to change
and become a new kind of rock: metamorphic rock.o This metamorphic rock, over time, continues to be pushed
farther into the Earth until it finally melts into magma.o This magma may eventually come in contact with a way
“out”, such as a volcano. o The magma flows out of the volcano in the form of lava,
becomes solid, and forms and extrusive igneous rock.o And the cycle starts over.
Introduction
Lesson
Quiz
The End
OOPS! Try Again!
Question #1Introduction
Lesson
Quiz
Question #2
Question #3
Question #4
Question #5
Question #6
The End
Click for Works Cited
Academic Content StandardGrade 6Earth and Space Sciences -Earth Systems 1. Describe the rock cycle and explain that there are sedimentary, igneous, and metamorphic rocks that have distinct properties (e.g., color, texture) and are formed in different ways.
http://www.beyondbooks.com/ear82/7.asp
http://www.windows.ucar.edu/tour/link=/earth/geology/rocks_intro.html
http://office.microsoft.com/en-us/clipart
Works Cited