Download Landforms from lava

LANDFORMS FROM
LAVA
LESSON 3 PART 1
LAVA CAN CREATE LANDFORMS
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Shield Volcanoes
Cinder Cone Volcanoes
Composite Volcanoes
Lava Plateaus
Calderas
SHIELD VOLCANOES
• A shield volcano is a wide, gently sloping mountain
made of layers of lava and formed by quiet
eruptions
SHIELD VOLCANOES
• Thin layers of lava pour slowly out of a vent and
harden on top of previous layers.
SHIELD VOLCANOES
• Hot spots typically form shield volcanoes
SHIELD VOLCANOES
CINDER CONE VOLCANOES
• A cinder cone volcano is a steep, cone-shaped hill
or small mountain made of volcanic ash, cinders,
and bombs piled up around a volcano’s opening.
CINDER CONE VOLCANOES
• Volcanoes whose magma has a high silica content
erupt explosively, producing ash, cinders, and
bombs.
CINDER CONE VOLCANO
• The ash, cinders, and bombs build up around the
vent in a steep, cone-shaped hill.
CINDER CONE VOLCANOES
COMPOSITE VOLCANOES
• A composite volcano is a tall, cone-shaped
mountain in which layers of lava alternate with
layers of ash and other volcanic materials.
COMPOSITE VOLCANOES
• Composite volcanoes are created when the silica
content of the magma varies. Sometimes the
magma is high in silica and erupts explosively; other
times the magma is low in silica and erupts quietly.
COMPOSITE VOLCANOES
LAVA PLATEAUS
• Lava plateaus are formed when thin, runny lava
flows out of several long cracks in an area. The lava
travels far before cooling and solidifying. Repeated
floods raise the elevation into plateaus.
LAVA PLATEAUS
CALDERAS
• A caldera is the large hole at the top of a volcano
formed when the roof of a volcano’s magma
chamber collapses.
CALDERAS
• A lake can form filling the hole.
CALDERAS
• If the volcano erupts again, a steep-walled cone
may form in the middle.
CALDERAS