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Transcript of Rock information.
turned into hardened liquid. Fine small
chrystals are what form the rock which is
found near Volcanoes in the ground, mainly
in the Hawaiian Islands. Igneous rocks are
used for road building and polished up for use
as a decorative surface.
Examples of Igneous Rock are:
Basalt, Pumice, Granite, Obsidian. Sedimentary Rocks are a build up of
plant and animal fossils and contain
parts of other worn down rocks and are
very grainy. They form where water
meets land and thus are mainly found
near streams, lakes, rivers and the sea.
Uses of this rock are for chalk and building.
Examples of Sedimentary Rocks are:
Sandstone, Colgomerate, Limestone. Metamorphic Rocks contain small crystals and
are streaked and banded in appearence. Usually, they are found in the Appalachian
Mountains in Eastern North America. They are
used for counter tops, floor tiles and statues.
Examples of Metamorphic Rocks are:
Marble, Gnesis, Limestone. The Three Main Types of Rock When we look at Igneous rocks,
we see that there are two types
in the category to consider. These
are Volcanic and Plutonic rocks.
The difference between the two
is that Volcanic igneous rocks cool
rapidly on the earths surface, while
Plutonic igneous rocks cool slowly
below the earths surface or
underground. Plutonic & Volcanic Rocks & Building Some rocks are used for building because they have properties that
serve the environment where a building is being constructed.
Examples of this are:
Brick - sturdy and solid, good for building but not decoration.
Marble - Shiny and fit for decoration.
Clay - Sound proof and compact.
Stone - Doesn't react with acid rain, sturdy and reliable.
Calcium Carbonate - Doesn't react with acid, therefore used in places
where acid rain is a regular occurence. Acid and Water Effects on Rocks Water has no affect at all on rocks, and this is because water
has a neutral pH level of 7-8. Acid, however has a pH level
of 0 which means it is, of course, highly acidic and corrosive.
Acid reacts with some rocks and after time, wears them away.
This is why in countries such as Europe, who recieve a lot of
acid rain,they use bulding materials that do not react with acids,
such as stone and calcium carbonate, so that the bulidings can
resist the acis rain.