Erosion and Deposition
Table of Contents
Wave Erosion
Ms. De Los Rios
6 th Grade

1. HeadlandA part of the shore that sticks out into the ocean.
2. BeachWave-washed sediment along a coast.
3. Longshore driftThe movement of sediment along a beach.
4. SpitA beach formed by longshore drift that projects like a finger out into the ocean.

Pg. 134
How do the waves get their energy from??
Waves contain energy and are formed by winds .
When wind contacts waves= transfers some energy to the waves.
How does waves shape the land?
Waves shape the coast through erosion by breaking down rock and moving sand and other sediment .

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pg. 135
1. One way waves erode is by
Waves
= hits rocks with force and they begin to crack, with time it breaks them.
2. Waves also erode by
waves carry sediment
(sand & gravel) and as the waves moves & hits land, the sediment wears rock away.

pg. 135
What is a headland?
A headland is a part of the shore that sticks out into the ocean
• Waves coming to shore gradually change direction.
• The change occurs as different parts of a wave begin to drag on the bottom.
• The energy of these waves is concentrated on headlands.
• Headlands are made of harder rock that resists erosion by waves.
• But over time, waves erode the headlands and even-out the shoreline.

pg. 135
Wave Erosion
Shade in the arrows that indicate where the greatest energy of the waves is concentrated.

pg. 136

pg. 136
How is a Sea cave, Wave-cut cliff, Sea arch & Stack created?
• Ocean waves that hit a steep, rocky coast erode the base of the land there. Where the rock is softer, the waves erode the land faster. Over time the waves may erode a hollow area in the rock called a sea cave . Eventually, waves may erode the base of a cliff so much that the rock above collapses. The result is a wave-cut cliff .
•
A sea arch is another feature of wave erosion that forms when waves erode a layer of soft rock that underlies a layer of harder rock. If an arch collapses, a pillar of rock called a sea stack may remain.

pg. 136
Deposition occurs when waves slow down, causing the water to drop its sediment .
Waves shape a coast when they deposit sediment, forming coastal features such as beaches, barrier beaches, sandbars, and spits. (B, BB, S, S)
A beach is an area of wave-washed sediment along a coast. The sediment deposited on beaches is usually sand. Most sand comes from rivers that carry eroded particles of rock to the ocean.

pg. 136-7
As waves repeatedly hit the beach at an angle, some of the beach sediment moves down the beach with the current, in a process called longshore drift .
One result of longshore drift is a spit , a beach that projects like a finger out into the water. Incoming waves carrying sand may build up sandbars , long ridges of sand parallel to the shore. A barrier beach is similar to a sandbar, but forms when storm waves pile sand up above sea level forming a long, narrow island parallel to the coast.

Wave Erosion
The Changing Coast
What are the different landforms called?
Were they formed by erosion or deposition ?