VOLCANOES

Question 1

VOLCANIC ACTIVITY

Answer 1

creates mid ocean ridges, volcanic islands and volcanic mountains
occurs at boundaries where plates separate and collide

Question 2

MID OCEAN RIDGES

Answer 2

magma rises up through cracks of the crust
cools, hardens and builds up forming a ridge of rock
eg. mid atlantic ridge -> american plates separating from eurasian and african plates, created a chain of mountains on the seabed

Question 3

VOLCANIC ISLANDS

Answer 3

mountains on the seabed
formed when magma wells up through cracks on the crust
sometimes rises above surface of oceans
eg. Iceland

Question 4

VOLCANIC MOUNTAINS

Answer 4

Magma can rise up a magma chamber in the crust through a vent
when at the surface it’s called lava
a vent is a narrow tube in the crust
lava hot ash and rocks are thrown into the air when volcanoes erupt
ash cloud is formed and material builds up around vent
as more eruptions occur more layers are added on top of each other
cone shaped mountain forms
example mount st helens

Question 5

POSITIVE EFFECTS OF VOLCANOES

Answer 5

lava makes soils rich in minerals, eg campania italy
tourist visit sites of volcanoes geysers are tourist attractions,
water heated by volcanic activity can generate geothermal energy to heat homes

Question 6

NEGATIVE EEFECTS OF VOLCANOES

Answer 6

gasses like sulfur dioxide can poison people and cause acid rain, this effects fishing, agriculture and forestry
lava burns everything in its path, huge loss of human life and destruction can be caused
volcanic materials mixing with water can make a mud called lahar, it can destroy anything in its oaths, happened in columbia in 1985