Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes...

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Volcanoes

Transcript of Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes...

Page 1: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Volcanoes

Page 2: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

• Volcanic eruptions are among the Earth's most powerful and destructive forces.

• Volcanoes are also creative forces. The Earth's first oceans and atmosphere formed from the gases given off by volcanoes. In turn, oceans and an atmosphere created the environment that made life possible on our planet.

Page 3: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Why Do Volcanoes Erupt?

• Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma.

• Magma is lighter than the solid rock around it, magma rises and collects in magma chambers.

• Eventually some of the magma pushes through vents and fissures in the Earth's surface. A volcanic eruption occurs!

Page 4: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.
Page 5: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Where Do Volcanoes Erupt?

• Tectonic plates float on a softer layer of rock in the Earth's mantle. As the plates move about they push together or pull apart. Most volcanoes occur near the plates boundaries.

• Some volcanoes occur in the middle of plates at areas called hotspots - places where magma melts through the plate and erupts.

Page 6: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.
Page 7: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

3 Main Types of Volcanoes

1. Stratovolcanoes

2. Cinder cones

3. Shield volcanoes

Page 8: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Stratovolcanoes

• Build from eruptions of lava that pile up in layers or strata (much like layers of cake and frosting)

• These volcanoes form symmetrical cones with steep sides.

Page 9: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Cinder cones

• Build from erupting lava that breaks into small pieces as it blasts into the air.

• As the lava pieces fall back to the ground, they cool and harden into cinders that pile up around the volcano's vent.

• Cinder cones are very small cone-shaped volcanoes

Page 10: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Shield volcanoes

• Form from eruptions of flowing lava.

• The lava spreads out and builds up volcanoes with broad, gently sloping sides.

Page 11: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Predicting Volcanic Eruptions

• Changes in heat flow

• Changes in shape

• Earthquake activity

• Increased gas emissions and steam

Page 12: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

http://www.pbs.org/wnet/savageearth/animations/volcanoes/main.html

Page 13: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Volcanoes are good!

• Produced our atmosphere

• Volcanic soil is very fertile

• Mineral resources (diamonds, copper, gold, pumice, bbq rocks)

Page 14: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.
Page 15: Volcanoes. Volcanic eruptions are among the Earth's most powerful and destructive forces. Volcanoes are also creative forces. The Earth's first oceans.

Magnitude Scale


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Unit 9 (packet #2): Volcanoes and Earthquakes...Unit 9 (packet #2): Volcanoes and Earthquakes 13. Earthquakes are one of the most destructive natural forces. I can… a. Explain what

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mi01000971.schoolwires.net€¦ · mountains, volcanoes. and craters. Some of Earth'S tallest mountains are under the ocean. Earth's atmosphere contains mostly nitrogen and some oxygen.

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Kimberly Chastain Table of Contents Types of volcanoes Volcanoes in Continents Parts of volcanoes Locations of volcanoes Multiple Eruption Volcanoes.

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Volcanoes · 2019-10-31 · Volcanoes Essential Standard 2.1: Explain how processes and forces affect the lithosphere Objective 2.1.1: Explain how the rock cycle, plate tectonics,

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Volcanoes General Science. What is a Volcano a crack in the earth's crust through which molten lava and gases erupt a crack in the earth's crust through.

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Chapter 12: Volcanoes!. Volcanoes and Earth's Moving Plates A volcano is an opening in Earth that erupts gases, ash and lava. Volcanic mountains form.

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VOLCANOES - · PDF fileand types of rocks can help classify volcanoes into shield, ... Lesson 1 - TYPES OF VOLCANOES MATERIALS: reader world map placemat ... The forces behind an erupting

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