geologic features (trench, atoll, rift valley and lake)
TRANSCRIPT
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GEOLOGICFEATURES
BY: SARAH JANE B. JARINA
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TRENCHIt is a deep and narrow
hole or ditch in the ground.
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TRENCH IN A CONVERGENT ZONE
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TWO WAYS WHERE TRENCH WAS FORMED1. OCEANIC-OCEANIC PLATES CONVERGE
2. OCEANIC-CONTINENTAL PLATES CONVERGE
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1. OCEANIC-OCEANIC PLATES CONVERGE
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Volcanic Island Arcs They result from the subduction of an oceanic tectonic plate under another tectonic plate, and often parallel an oceanic trench.
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VOLCANIC ISLAND ARC - a solitary mountain formed by volcanic activity. Lava erupting from the sea floor builds up on the sea bed over thousands, or even millions of years.
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2. OCEANIC-CONTINENTAL PLATES CONVERGE
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Volcanic Arc-It is a chain of volcanoes formed above a subducting plate, positioned in an arc shape.-it was formed when two oceanic plates converge.
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RIFT VALLEYIt is a linear-shaped lowland
between several highlands or mountain ranges.
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How valley was formed?
It is formed in a divergent plate boundary.
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As the crust pulled apart, large slabs of rock sink, generating a rift zone.
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Rift valleys
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ATOLL
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• It is a ring-shaped coral reef, island, or series of islets.
• Develop with underwater volcanoes called seamount.
ATOLL
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How atoll was formed?
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It was developed in underwater volcanoes.
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Lady Musgrave Island Coral Atoll in Australia
Hermatypic corals/ Hard corals Corals that buid a reef below the ocean surface.
Fringing Reef A reef that was built by corals.
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Great Blue Holeto
Lagoon An area of sea water that is separated from the ocean by a reef or sandbar.
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•All lakes fill bowl-shaped depressions in the Earth's surface, called basins.•A lake is a body of water that is surrounded by land.
LAKE
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How lake was formed?
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Ice
water
How lake was formed?
Many lakes, were formed by glaciers that covered large areas of land during the most recent ice age, about 18,000 years ago.
GLACIAL LAKE
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How lake was formed?CRATER LAKE
After a volcano becomes inactive, its crater may fill with rain or melted snow.
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How lake was formed?
BY THE PLATE TECTONIC
Some lake basins form where plate tectonics changed the Earth’s crust, making it buckle and fold or break apart.
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