Gneissic rock forms from metamorphism. Metamorphism changes the form, mineralogy, texture, and sometimes chemical composition of rocks through heat, pressure, and chemically active fluids. Gneissic rock has a banded appearance due to foliation and does not split easily. Quartz is another metamorphic rock that forms from sandstone and is very hard with fused quartz grains. Sedimentary rocks cover about 75% of land and ocean floors, forming from particles of eroded material transported and deposited by water, wind, glaciers or mass movement.

1. ROCKS
Types Of Rocks

2. Metamorphism Rock
Gneissic
• Gneissic rock come from the Metamorphism rock.
• Metamorphism rock change the form.
• The changes are in the mineralogy, texture, and
sometimes the chimical composition of rocks
• Metamorphism rocks takes place usually in elevates
temperatures and pressures.
• This rocks gradually changes until state of equilibrium
with the new enviroment.
• The Agents of metamorphims include heat, pressure,
and chemically active fluids.

3. Gneissic
• Gneissic rock is common and widely
distributed type of rock.
• The rocks with a banded appearence are call
gneissic.
• Foliated gneissic will not usually split as easily
as slates and some schists.
• This gneissic rock I found in Turlock.
• The place was in my way to Turlock near to
highway

4. Gneissic
• I identify the rock for the texture because are
a little dark biotite flakes and the light silicate
minerals.
• Given the rock a banded or layered
appearance.
• Gneissic is a foliated texture

5. Quartz
• The Changes on Metamorphism rocks
increased the density, change in size,
reorientation of mineral grains
• The transformation of low temperature
minerals into high temperature minerals.
• Metamorphism rocks can be broadly classified
in foliation exhibited and to lesser extend on
the chemical composition.
• Quartz is a very hard metamorphism rock.

6. Quartz
• The quartz is a non foliated texture
• Fused quarts grains, massive, very hard
• We can find this type of rock in the water or near
to it.
• The quarts are formed in sandstone.
• Quartz formed under moderate to high grade and
the grains in sandstone fuse together.
• The quartz ridges are often bare or covered only
with very thin layer of soil and a little vegetation.

7. I identify this rock because is near to the water in yosemite and this rock
shows grains typical of a quarts and this rocks are white to gray.

8. Sedimentary Rocks
• About 75 percent of the land areas are covered
by sediments and sedimentary rocks.
• Across the ocean floor the earth solid surface,
virtually everything is covered by sediment.
• This rocks are mostly located in mid ocean, water
and at some volcanic areas.
• The particles of the sedimentary rocks by
accumulating is call sediment.

9. Sedimentary Rocks
• The sediment are formed by weathering and
erosion in a source area and then they are
transported to the place of deposition by
water, winds mass movement or glaciers
• This group of rock provides geologists with
much of the basic information they need to
reconstruct the details of Earth history.