Science

HOW ARE ROCKS USED?
In the past: buildings, bridges, city walls, aqueducts, roads.
Today: most modern constructions are not made of stone.
HOWEVER THEY USUALLY CONTAIN SOME FORM OF ROCK:CONSTRUCTION MATERIALS: Granite, limestone and slate are strong, decorative, and provide good insulation.
Cement: is made of limestone and clays. Concrete is used for roads, bridges, dams and entirebuildings.
Plaster: is made of gypsum and other ingredients. It is used on interior walls.
Ceramic material: are made of clay. They are used for tiles, bricks an bathroom pieces.
DECORATION: Graniteand marble are the most popular. They are used for sculptures, floors, kitchen countertops.
CONTAINERS: Clay is used to make pottery and china.
FUELS: Coal and oil are used in transportation,industry, heatind and to produce electricity.
CHEMICAL INDUSTRY: Oil is used to make plastics, paints, fertilizers, synthetic fibres.
MATCH EACH PHOTO WITH ONE OF THE USES OF ROCKS:
* Stonehenge(England) is made of sandstone.
* The Roman aqueduct in Segovia is made of granite.
* Many buildings are decorated with stone
* Concrete, glass and metals are made from rock.
* Many statuesand monuments are made of marble.
* Clay is used to make plates and pottery.
* Refineries process oil into fuel.
* Plastics are made from oil.
WHAT ARE ROCKS?
The solid part if the Earthis made up rocks. Rocks are any natural, inorganic material made up of minerals.
WHAT ARE MONOMINERALIC ROCKS?
Some rocks are made of a single substance. Others can be in liquid form (oil).
HOWARE ROCKS CLASSIFIED?
IGNEOUS ROCKS: Are formed from cooled magma. These rocks are formed by minerals joined together (In granite it is easy to see the various components)
SEDIMENTARY ROCKS: Areformed by the accumulation and compaction of sediment (clay, sand or rock fragments). Conglomerate
METAMORPHIC ROCKS: Are formed from other rocks by the effects of heat and pressure. Slate

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