Impact crater
Igneous rock
When molten rock
cools, igneous
rock is formed.
magnet
A magnet attracts
things made of
iron.
Impact craters are
the remains of
an asteroid or
Earth.
beautiful
Iron is a common
pipes.
metal
A metal is an element
that has a crystalline
structure when it is solid
electricity. Some metals
include iron, copper,
silver, and gold.
comes out of erupting
tracks, pots, and volcanoes.
deep inside the earth.
limestone
Limestone is a type of
sedimentary rock that
is made of the
skeletons of tiny
microorganisms.
mineral
A mineral is a naturally-
occurring solid whose
molecules form a regular
pattern (usually forming
crystals). Some common
minerals include quartz,
salt, diamond, and
feldspar.
pebble
A pebble is a
small, smooth
stone.
sand
Sand is a loose
material
composed of fine
debris of rock and
mineral particles.
quartz
Quartz is a
common crystalline
mineral.
sedimentary
rock
Sedimentary rock
is rock that has
formed from
sediment and is
where most fossils
are found.
rock
A rock is a stone. The
Earth's crust is made
of rock.
silver
Silver is a valuable
metal; it is also the
shiniest metal. Some
coins and jewelry are
made from silver.
ruby
A ruby is a hard,
shiny, red jewel.
soil
Plants grow in soil.
salt
Salt is an important
crystalline mineral
that we use to season
our food.
solid
A solid is a matter in
which the molecules
are very close together
and cannot move
around. Ice, quartz,
and diamonds are
solids.
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iron
lava
collisions
between
metal
that is used for Lava is molten rock. It
meteorite
and the many things, like train
metamorphic
rock
marble
Metamorphic
rocks
Marble
is a
are
compacted by
form.
Many metals are
pressure and heat from
metamorphic
rock.
shiny and many conduct
stone
A stone is a rock.
streak
A streak is a long
mark or stripe of
color.
tsunami
A tsunami is a rare,
giant series of waves
caused by an
underwater
earthquake or other
large-scale,
underwater
disturbance.