Transcript Volcanoes, Earthquakes, Tsunamis, and Landslides!

Volcanoes
Notes:
Volcanoes are mountains with openings in
Earth's crust through which magma, gases,
and ash reach the Earth's surface.
Volcanoes can change the Earth's surface.
When magma (melted rock) erupts from the
volcano the top of the mountain can be
changed, either built up or exploded off.
The lava and ash can destroy forests and
bury fields.
Magma is melted rock beneath the
Earth's surface. Once magma reaches the
Earth's surface, it is called lava.
Volcanic eruptions can change Earth's
weather patterns.
Are volcanoes considered to be a
constructive or destructive force?
Why?
Earthquakes, Tsunamis,
and
Landslides
How does Earth move?
The Earth is made of layers. The outer layer is the
crust. The crust is broken into 30 pieces called
tectonic plates. The crust floats on the next layer
of the Earth called the mantle. The mantle is made
of molten rock called magma.
The tectonic plates have been moving for hundreds
of million years! This movement is the cause of
many of the Earth's landforms.
Let's take a closer look at plate tectonics...
Where are Earth's plates?
How does the Earth's movement create
mountains?
When Earth plates push toward each other, a
mountain is formed.
What are earthquakes?
Earthquakes are vibrations on Earth's
surface caused by a sudden movement in
the Earth, often along a fault. A fault is
a break in the Earth's surface.
Some earthquakes cause little damage
while others cause a lot of damage.
The scale that scientists use to measure the
strength of an earthquake is called the
Richter Scale.
Here is another form of the Richter Scale.
What is a landslide?
Landslides occur in all U.S. states and territories. In a
landslide, masses of rock, earth, or debris move down a
slope.
Landslides may be small or large, slow or rapid. They are
activated by:
sstorms
searthquakes
svolcanic eruptions
sfires
salternate freezing or thawing
ssteepening of slopes by erosion or human modification
What are tsunamis?
A tsunami is a series of enormous waves
that happen after an undersea disturbance,
such as an earthquake, landslide, or volcano
eruption.
Please remember that tsunamis are NOT related to the weather!!!!