verbal to non-verbal :
the three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences
among them have to do with how they are formed. sedimentary rocks are formed from particles of sand,
shells, pebbles, and other fragments of material. together, all these particles are called sediment.
examples of this rock type include conglomerate and limestone. metamorphic rocks are formed under
the surface of the earth from the metamorphosis (change) that occurs due to intense heat and pressure
(squeezing). the rocks that result from these processes often have ribbon like layers and may have shiny
crystals, formed by minerals growing slowly over time, on their surface. examples of this rock type
include gneiss and marble. igneous rocks are formed when magma (molten rock deep within the earth)
cools and hardens. sometimes the magma cools inside the earth, and other times it erupts onto the
surface from volcanoes (in this case, it is called lava). examples of this rock type include basalt and
obsidian.
Answers
Answer:
There are three kinds of rock: igneous, sedimentary, and metamorphic.
Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers. Metamorphic rocks result when existing rocks are changed by heat, pressure, or reactive fluids, such as hot, mineral-laden water. Most rocks are made of minerals containing silicon and oxygen, the most abundant elements in the Earth’s crust.
In This Section
EXHIBIT
Igneous Rocks
Igneous rocks solidify from molten rock (called magma within the Earth and lava on the surface).
EXHIBIT
Sedimentary Rocks
Sedimentary rocks are layered.
EXHIBIT
Metamorphic Rocks
Metamorphic rocks form when sedimentary, igneous, or pre-existing metamorphic rocks are changed by environmental factors.
Rocks
types:sedimentary - metamorphic - igneous
formed from : sand - shells - pebbles
example :conglomerate - limestone - gneiss - marble