119
3
The Geosphere
Answer key
Remember
28.
Make a table of rocks used to make building
materials. Include what materials they are used to
make and the uses of those materials.
Rocks
Materials
Uses
Cement
Limestone and clay Stick rocks
together
Concrete
Cement, water,
sand and gravel
Build pillars and
foundations
Ceramics
Pulverised clay
mixed with water
Make bricks, tiles
or dishes
Glass
Quartz present in
sand
Make windows,
bottles, glasses
29.
Which types of rocks are usually used for decoration?
Plutonic rocks because of their beauty once they have been
cut and polished.
Understand
30.
Explain the difference between concrete and cement.
Cement is made from grinding and heating limestone and
clay. Concrete is created by mixing cement, water, sand and
gravel. When dry, it is harder and stronger than cement. This
is why it is used for pillars and foundations.
Understand
31.
What type of superficial extraction is shown in the
picture?
It is an opencast mine, they are making a funnel-shaped hole
(piles) to extract.
32.
Explain in your own words the difference between a
subterranean mine and a quarry.
In subterranean mines, vertical tunnels called shafts and
horizontal tunnels or galleries are constructed to extract the
minerals while in quarries, minerals are extracted from the
surface or not very deep under the surface and it has a great
impact on the environment. Large rocks are extracted and
cut into blocks or slabs.
