[bai-giai-den-roi-cham-com]-Luyen-doc-reading-voi-bo-giao-trinh-oxford-level-5

It can be very difficult to find materials, and many of
them come from under the ground or underwater.
How do we find and collect these materials?
We find different minerals
in different types of rock.
People called geologists
study different rocks to
find minerals in them.
They also study rivers
and oceans to see what
minerals are in the water.
Other scientists use
machines to measure how
electricity and radio signals
go through different rocks
in the ground. They also
use trucks that hit the
ground, and then machines
measure how the ground
moves. This tells them
about the rocks and
minerals under the ground.
ound
Machines called drills make holes in the ground and
collect small pieces of rock. Geologists study this rock
to look for minerals. People also use drills to take oil
from the ground. They make holes called oil wells, and
they use pumps to take liquid oil from the ground.
People use oil platforms to get oil from under the
ocean. Some platforms stand on big legs under the
water. It's difficult to get the oil because the water is
very deep and the weather can be bad, too.
The Petronius oil
platform between Mexico
and the USA is 609 meters
tall. and 435 meters of it
is under the water!