10. 1- Hardness:
There is a scale
called: Moh’s scale
that tells the
hardness of the
minerals.
11. 2- Color:
It’s not the best way
to identify minerals
as some minerals
can have many
colors like: Quartz.
(It can be pink,
purple, blue, yellow
& white)
12. 3- Streak:
It is the color of the
powder that a
mineral leaves
behind when you
scratch it along a
white tile.
13. 4- Luster:
It is the way light bounces off the surface of the
mineral.
(some minerals have metallic luster)
(Others have dull luster “not shinny”)
(Others have glassy luster)
14. They are natural solids which are
made of one or more minerals
together.
Example:
Granite
{Mixture of Mica + feldspar + Quartz}
Rocks
16. They are rocks that are formed when
rocks come out of a volcano “melted” &
then cooled & hardened on earth’s
surface.
If they are cooled quickly:
rocks will look like glass (ex: Obsidian)
If they are cooled slowly:
rocks will have large grains (ex: Granite)
18. (They are rocks that form from materials that
has settled into layers)
The layers are squeezed together to form a
rock.
Examples:
Limestone Sandstone
19. How are sedimentary rocks formed?
- Wind & water break big rocks into bits
& pieces, then the small pieces are
carried by the wind or water and settle
into layers & after a long time they
become harden & form sedimentary
rocks.
20. Limestone is used for making glass.
Shale is used in making bricks , pottery &
china.
Limestone & shale are used in making
cement.
21. Temperature & pressure can change rocks
from one type to another.
Metamorphic rocks are rocks that have been
changed by temperature & pressure.
Example:
Gneiss Marble
22. Slate is used for tiles of roofs & walk ways .
Marble is used to making monuments &
statues.
