Transcript Table of Contents - Mr. Tobin`s Earth Science Class

Table of Contents
Title: Erosion and Deposition
Page #: 54
Date: 1/14/2013
Objective
• Students will be able to describe the
relationship of gravity to the agents of
erosion.
Word of the Day
• Gravity: A force of attraction between
objects due to their masses.
Erosion and Deposition
•
•
***Erosion transports weathered
materials across Earth’s surface until
they are deposited.***
3 Step Process:
1. Weathering breaks rocks
2. Erosion carries pieces away
3. Deposition drops materials in another
location
Erosion and Deposition
•
Agents of erosion:
1.
2.
3.
4.
5.
Running water
Glaciers
Wind
Ocean currents / waves
Gravity - The most important!
Erosion and Deposition
•
•
Gravity: Associated with most agents
of erosion because it pulls materials
down slope.
Gravity causes streams and glaciers
to flow and pulls loose sediments
down slope.
Erosion and Deposition
Glacial Erosion
Stream Erosion
Erosion and Deposition
•
Erosion by Water:
–
•
Moving water is the most powerful agent of
erosion.
Wave Action:
–
Erosion occurs along the ocean floor, at
continental and island shorelines.
Erosion and Deposition
•
Wave Action:
– Ocean currents, waves and tides
•
•
Carve out cliffs and arches
Form dunes and beaches on shorelines when
particles accumulate.
Erosion and Deposition
Erosion and Deposition
•
Erosion along shorelines
–
–
A constant and continuous process.
Sand along shorelines is picked up, moved and
deposited by ocean currents.
 Creates sandbars that can grow into barrier
islands.


Common along Atlantic and Gulf coasts.
Example: North Carolina’s Outer Banks.
Erosion and Deposition
Outer Banks
Barrier Island
Sandbar
North Carolina’s
Outer Banks
Barrier Islands
Erosion and Deposition
•
Erosion
along
shorelines
 Destroys
shorelines
by washing
sand away.
Erosion damage on Plum Island, MA