Transcript More about the Earth`s crust

Watch this. What happened in Kobe, Japan, in 1995?
This topic asks important questions. Why do things like this
happen? Can anything be done about them? Who do they
effect?
A slice through the earth
This lesson, we’ll see that the first thing we need to
understand in order to explain earthquakes and
volcanoes, is the structure of the Earth. We’ll learn about
the three layers that make up the Earth – and then take
a closer look at the layer we live on.
How did the layers form?
After the Earth was made, it got so
hot that everything inside it melted.
The heavier substances in the
liquid sank and the lighter ones
rose, forming layers. As the Earth
cooled, most of the layers turned
solid.
Hot hot hot
A great deal of heat is still trapped
inside the Earth. That’s why it gets
hotter as you go down through it.
200 km down, the rocks are
glowing white hot. At the centre of
the Earth, the temperature is
around 5500ºC.
More about the Earth’s crust
There are two types of crust. The crust under the oceans is
called the oceanic crust. It’s a thin layer of heavy rock. The
continental crust is made of lighter rocks and forms the
continents. Take a look on the next page.
The structure of the earth
Crust
Core
Mantle
1. Make a copy of this diagram in your books.
2. Make a table like this and fill it in for the Earth’s layers.
3. It is approximately 6380 km from the crust to the core. If
you cycle at 20 km an hour, how long will it take you to cycle
to the centre of the Earth?
4. Make a larger drawing like this and complete the labels.
So, this topic is about earthquakes. Earthquakes happen
everywhere – even in lego street.