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ChapC1.3

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Information about ChapC1.3

Published on March 4, 2008

Author: stviator4b

Source: slideshare.net

Description

Volcanoes
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Volcanoes

How Volcanoes Form volcano: a mountain that forms when red hot melted rock flows through a crack into the earth’s surface magma: melted rock inside the Earth lava: melted rock that reaches the Earth’s surface

volcano: a mountain that forms when red hot melted rock flows through a crack into the earth’s surface

magma: melted rock inside the Earth

lava: melted rock that reaches the Earth’s surface

volcanoes form ocean floors plates move apart and magma slowly rises toward the surface from deep in the mantle magma gets to the surface - cools, hardens and forms new ocean floor volcanoes form when plates move toward each other plates collide one plate is forced down into the mantle - melts partly magma rises through the vent to form mountains vent: a rocky tube that carries magma to the surface Andes in South America and Cascade Range in the NW US formed this way

volcanoes form ocean floors

plates move apart and magma slowly rises toward the surface from deep in the mantle

magma gets to the surface - cools, hardens and forms new ocean floor

volcanoes form when plates move toward each other

plates collide one plate is forced down into the mantle - melts partly

magma rises through the vent to form mountains

vent: a rocky tube that carries magma to the surface

Andes in South America and Cascade Range in the NW US formed this way

The Andes in South America Cascade Range in NW US

volcanoes form when a plate moves over a hot spot in the mantle fountains of hot rock punch through the crust to form volcanoes volcanic islands of Hawai’i formed this way Hawaiian Volcanoes

volcanoes form when a plate moves over a hot spot in the mantle

fountains of hot rock punch through the crust to form volcanoes

volcanic islands of Hawai’i formed this way

Types of Volcanoes Shield volcano : large mountains with gentle slopes form from runny lava many volcanoes in Hawai’i are shield volcanoes the largest is Mauna Loa on the main island and is about 30,000ft from the ocean floor

Shield volcano : large mountains with gentle slopes

form from runny lava

many volcanoes in Hawai’i are shield volcanoes

the largest is Mauna Loa on the main island and is about 30,000ft from the ocean floor

Cinder cone volcanoes : small volcanoes made of hardened lava chunks called cinders steep sides usually less than 1000 ft tall

Cinder cone volcanoes : small volcanoes made of hardened lava chunks called cinders

steep sides

usually less than 1000 ft tall

Composite volcanoes : medium sized moutains made of layers of alternating layers of lava and cinders have steep peaks and gently sloping sides Mount Fuji in Japan, Mount Pelee on the island of Martinque, and Mount Vesuvius in Italy were formed this way

Composite volcanoes : medium sized moutains

made of layers of alternating layers of lava and cinders

have steep peaks and gently sloping sides

Mount Fuji in Japan, Mount Pelee on the island of Martinque, and Mount Vesuvius in Italy were formed this way

Mount Fuji in Japan Mount Pele on Martinque Mount Vesuvius

Volcanoes Build volcanic eruptions form new crust on continents volcanoes add to Earth’s landscape Crater Lake in Oregon volcanic eruptions have good effects on the land around them soil around an active volcano has minerals that help crops grow - minerals are added when water flows over the rock many types of plants grow in the soil surrounding the slopes of Mout Vesuvius fruits and vegetables grow well near the bottom Hardwood trees grow well in the soils on the slopes

volcanic eruptions form new crust on continents

volcanoes add to Earth’s landscape

Crater Lake in Oregon

volcanic eruptions have good effects on the land around them

soil around an active volcano has minerals that help crops grow - minerals are added when water flows over the rock

many types of plants grow in the soil surrounding the slopes of Mout Vesuvius

fruits and vegetables grow well near the bottom

Hardwood trees grow well in the soils on the slopes

Volcanoes Destroy lava and gases that erupt from volcanoes are very hot and often destroy everything in their path Mt. St. Helens in WA erupted in 1980 - temp of ashes and gases reached 1470 degrees F blast blew down trees 15 mi away 60 people died clouds of ash and gases were so thick people couldn’t breath

lava and gases that erupt from volcanoes are very hot and often destroy everything in their path

Mt. St. Helens in WA erupted in 1980 - temp of ashes and gases reached 1470 degrees F

blast blew down trees 15 mi away

60 people died

clouds of ash and gases were so thick people couldn’t breath

 

1983 Colo volcano on the Indonesian island of Una Una erupted scientists were able to warn people 7000 peole who lived in the area went to safe places when the volcano erupted much was destroyed but nobody died

1983 Colo volcano on the Indonesian island of Una Una erupted

scientists were able to warn people

7000 peole who lived in the area went to safe places

when the volcano erupted much was destroyed but nobody died

Summary Volcano is a mountain that forms when melted rock called lava flows out onto the Earth’s surface Most volcanoes form along plate edges Volcanic eruptions add crust to the Earth and can be harmful Lava flows can make soils rich in minerals that help crops grow

Volcano is a mountain that forms when melted rock called lava flows out onto the Earth’s surface

Most volcanoes form along plate edges

Volcanic eruptions add crust to the Earth and can be harmful

Lava flows can make soils rich in minerals that help crops grow

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