Science primary4 T2 concept4.1 L4 erosion,depositio شرح وحل اسئلةالمعاصر #science #primary #المعاصر

ساينس رابعة لعات وتجريبي ترم تانى من المعاصر 2024
Science primary4 second term concept 4.1 L4
Erosion and deposition
الدرس الرابع ساينس رابعة كونسبت 4.1

Erosion:
It is the process in which the small particles (sediments) of sand, soil and rocks
are moved to other places by wind, water and gravity.

Action of-wind erosionAction of
water erosion Action of gravity erosion A gentle wind may carry sand grains for a short distance (about 1 meter), while stronger wind and hurricanes carry them for a longer distance.
The broken weathered rocks in a mountain can be pulled down at mountainsides by the effect of gravity.

{Notes
1. Sediments are small solid materials such as sand, soil and small particles of rocks.
2. Sediments are moved by wind and water and settles on the surface of land or
the bottom of water bodies such as lakes and seas.
3. You can see the evidence left by erosion after hundreds, thousands or millions
of years from its occurrence.

UNIT
4 CONCEPT 1
Activity 10 Deposition
We have learned from the previous lessons how rocks can be broken into smaller
pieces through weathering process, and these small pieces are carried away
through erosion process.
- After erosion, the deposition process is the next stage that shows where
these pieces of rocks might end up.
- When the wind blows, it picks up sand into the air.
- As the wind moves, the sand may travel with it to a new place.
- When the wind stops blowing, the sand falls onto the ground and deposites.
Deposition:
It is the process of laying down of sediments after its erosion.
• Now, let's see some examples that show how deposition process affects the
shape of land.
Action of water in deposition
- Running water in rivers play an important role in
deposition process such as :
• A river can deposite a sandbar along its banks (sides).
• When a river carries sediments meet a sea, these
sediments are deposited there forming a delta such as
the Nile Delta.
El Giza
The Nile Delta
Delta:
It is a fan-shaped (triangle-shaped) mass of mud and other sediments that
forms where a river enters a large body of water.
• Sea waves also move sand from one place to another new place where it
deposites there.
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