Ababa, Roda, Dela Cruz Reporting on Fil.

This is our reporting in Komunikasyon

1. HOW STRATIFIED
ROCKS ARE
FORMED

2. Stratified rocks, also known as
sedimentary rocks, are formed through
a process called stratification where
layers of sediment accumulate and
solidify over time. This process involves
several key steps:

3. The Formation
of Stratified
Rocks

4. 1. Weathering

The journey begins with the
breakdown of existing rocks, a
process called weathering. This
can occur through various
mechanisms:

5. PHYSICAL WEATHERING Rocks are
broken down into smaller pieces by forces
like wind, water, ice, or temperature
changes.
CHEMICAL WEATHERING: Chemical
reactions, such as oxidation or acid rain,
alter the composition of rocks, weakening
them and causing them to break down.

6. Biological weathering: Living
organisms, like plants and
animals, contribute to
weathering through processes
like root growth or burrowing

7. 2. Erosion and Transport

Once weathered, rock fragments are
transported by agents like wind, water,
or glaciers. These agents carry the
sediments to new locations, often
sorting them based on size, weight, and
shape.

8. 3. Deposition

As the transporting agents lose
energy, they deposit the sediments
in layers. These layers can be
formed in various environments,
including:

9. RIVERS: Sediments are deposited along
riverbeds, forming layers that reflect the
changing flow of the river.
OCEANS: Sediments settle on the ocean
floor, creating layers that can be
influenced by currents, tides, and marine
organisms.

10. LAKES: Sediments accumulate in lakes,
forming layers that often reflect
changes in water levels or the types of
organisms present.
DESERTS: Wind carries sand and dust,
depositing them in layers that can form
dunes or vast sand sheets.

11. 4. Compaction and Cementation

Over time, the weight of overlying sediments
compresses the lower layers, squeezing out water
and air. This process is known as compaction.
Simultaneously, dissolved minerals in the water
between sediment particles precipitate out, binding
the particles together through a process called
cementation. This process transforms the loose
sediment into a solid rock.

12. 5. Stratification5. Stratification

The distinct layers formedThe distinct layers formed
during deposition areduring deposition are
p
reserved through compaction
p
reserved through compaction
and cementation, resulting inand cementation, resulting in
the characteristicthe characteristic
stratification of sedimentarystratification of sedimentary
r
ocks. These layers can vary in
r
ocks. These layers can vary in
thickness, composition, andthickness, composition, and
color, providing valuablecolor, providing valuable
information about theinformation about the
environment in which theyenvironment in which they
were formedwere formed

13. - Sandstone: Formed from cemented sand
grains.
- Shale: Formed from compacted clay and
silt.
- Limestone: Formed from the
accumulation of marine organism shells.
- Conglomerate: Formed from cemented
gravel and pebbles.

Example Of Stratified Rocks
sandstone
limestone
conglomerate
shale

14. The formation of stratified rocks is a complex
process that takes place over millions of years. The
layers within these rocks provide a valuable window
into Earth's history, revealing past environments,
geological events, and the evolution of life.
Understanding the formation of stratified rocks is
essential for fields like geology, paleontology, and
environmental science.