Download IGNEOUS ROCKS There are places on Earth that are so hot that

IGNEOUS ROCKS
There are places on Earth that are so hot that rocks melt to form magma.
Because magma is liquid and usually less dense than surrounding solid rock, it
moves upward to cooler regions of the Earth. As the magma cools, it solidifies
and crystallizes into an igneous rock. Magma can cool on the Earth's surface,
where it has erupted from a volcano (extrusive rock) or under the Earth's
surface, where it has intruded older rocks (intrusive rock).
Extrusive igneous rocks form when magma reaches the Earth's surface through
a volcano; then, magma becomes lava because of the loss of gases and cools
quickly. Most extrusive (volcanic) rocks have small crystals. Examples include
basalt, andesite and rhyolite.
BASALT
ANDESITE
RHYOLITE
Intrusive, or plutonic, igneous rocks form when magma cools slowly below the
Earth's surface. Most intrusive rocks have large, well-formed crystals.
Examples include granite, diorite and syenite.
GRANITE
DIORITE
SYENITE
The elements that compose the magma combine within a melt to form silicate
minerals, the most common minerals of igneous rocks. These silicate minerals
include feldspars (plagioclase feldspar, potassium feldspar), quartz, micas
(muscovite, biotite), pyroxenes (augite), amphiboles (hornblende), and
olivine. These minerals make up over 95% of the volume of the common
igneous rocks, making igneous rocks easy to identify.
http://www.mineralogy4kids.org/rock-cycle/igneous-rocks
ACTIVITY
Put the letters of the corresponding characteristics in the correct box below.
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
ANDESITE
Slow cooling
Magma solidification
Fast cooling
Small crystals
In depth
Extrusive
Intrusive
Lava solidification
Large crystals
On surface
DIORITE
BASALT
SYENITE
GRANITE
¿Can you convert the following sentences into questions?

Igneous rocks are formed when magma cools and solidifies; this can
occur above or below the Earth's surface.

Magma can be forced into rocks, blown out in volcanic explosions or
forced to the surface as lava.

The atoms and molecules of melted minerals are what make up
magma.

There are over 700 different types of igneous rocks.

Examples of igneous rocks include basalt, granite, pumice, diorite,
gabbro and andesite.

Granite is a common rock that contains at least 25% quartz and is
sometimes used in construction because of its strength.

Pumice is an unusual, lightweight rock formed when molten rock is
rapidly blown out of a volcano, forming bubbles as it quickly loses
pressure and cools at the same time.

The upper section of the Earth's crust is made up of around 95% igneous
rock.
http://www.sciencekids.co.nz/sciencefacts/earth/igneousrocks.html