Geography constructive and destructive waves

Study the diagram to the right and watch the West Wales Spits video to the right. This process resulted in the formation of lakes and marshes. Fjords are flooded glacial valleys and rias are flooded river valleys.

Sometimes, the blockade of the rivers is so immense that even the main course of the river is changed. These waves are known as seismic waves.

Essay on Earthquakes: Top 5 Essays on Earthquakes | Geography

Which ones stop erosion. As the ice sheets receded the reverse process happened, as the land was released from the weight. The two main factors that determine the size and power of a wave are the strength of the wind and the distance over which it blows.

Two major earthquakes of Bihar-Nepal border in and can explain the impact of earthquake disasters on human structures and human lives.

Neap and Spring Tides from https: This means they have to travel through something a medium which, in the case of ocean waves, is water. Sea levels are currently quite high, while just 18, years ago during the Pleistocene ice age they were quite low. They reduce the quantity of sediment present on the beach by carrying it out to bars under the sea.

Explain what happens to the area behind the spit and the original shoreline. LSD is reliant on a constant supply of sediment from rivers and if sediment supply is stopped or sediment falls into a submarine canals at any point along a beach, this can lead to bare beaches further along the shore.

Watch an animation of this process here. Constructive waves predominate in calmer weather conditions when less energy is being transfered to the water.

Faulting and Elastic Rebound Theory: They do the opposite to destructive waves and increase the size of the beach by piling sediment up onto the berm. Iceland owes its existence to this ridge.

The volcanic arc is the surface expression of the magma that is generated by hydrous melting of the mantle above the downgoing slab. When one plate is composed of oceanic lithosphere and the other is composed of continental lithosphere, the denser oceanic plate is subducted, often forming an orogenic belt and associated mountain range.

The transfer of energy into the water combined with the turbulence produces perturbations in the surface of the water that eventually become waves. Cataclysmic events like earthquakes, submarine volcanic eruptions or landslides generate immense waves known as tsunamis 1.

Temperatures that vary from below to above freezing point result in frost weatheringwhereas weather more than a few degrees below freezing point creates sea ice. Consequently, shallow focus earthquakes are caused along the constructive plate boundaries or say along the mid-oceanic ridges. The frequency of these waves was 6 per minute.

Don't forget that a cost-benefit analysis is always required before deciding on whether to protect a stretch of coastline. The swash is more powerful than the backwash, so more material is carried up the beach than is pulled back down it. A really good example of this is the mid Atlantic Ridge, where the Eurasian plate moves away from the North American plate at a rate of around 4cm per year.

The main causes of earthquakes fall into five categories: The lack of sediment on headlands removes the protection of waves from them and makes them more vulnerable to weathering while the gathering of sediment in bays where longshore drift is unable to remove it protects the bays from further erosion and makes them pleasant recreational beaches.

Here, the Indo Australian plate is colliding with the Eurasian plate and has done so for millions of years. Kurduvadi rift and Koyna rift. In some beaches calcium carbonate is able to bind together other sediments to form beachrock and in warmer areas dunerock.

These melts rise to the surface and are the source of some of the most explosive volcanism on Earth because of their high volumes of extremely pressurized gases.

5 Main Causes of Earthquakes

When two plates with oceanic crust converge, they typically create an island arc as one plate is subducted below the other. A complete, fully resourced waves lesson covering: olivierlile.comuctive and Destructive Waves 2.

Swash and Backwash 3. Fetch Suitable for studying coasts at both KS3 and KS4. Types of plate and crust Plate margins Find out more You Tube. The plates and plate margins.

Coastal processes

The Earth's crust is divided up into chunks of solid rock called tectonic plates. What causes waves? Waves and coastal interaction Constructive and Destructive waves Wave Refraction Tides.

Waves are essentially the movement of water molecules within the ocean, and are restricted to the surface layers of our oceans and seas. Destructive waves are associated with stormy conditions and occur where there is a long fetch and strong winds.

The waves in the picture were breaking at a frequency of 14 per minute, each swash being interrupted by the powerful backwash of the previous wave. In plate tectonics, a convergent boundary, also known as a destructive plate boundary, is a region of active deformation where two or more tectonic plates or fragments of the lithosphere are near the end of their life cycle.

This is in contrast to a constructive plate boundary (also known as a mid-ocean ridge or spreading center). As a result of pressure, friction, and plate material melting. Destructive waves are associated with stormy conditions and occur where there is a long fetch and strong winds.

The waves in the picture were breaking at a frequency of 14 per minute, each swash being interrupted by the powerful backwash of the previous wave.

Geography constructive and destructive waves
Rated 3/5 based on 18 review
BBC Bitesize - GCSE Geography - Coastal processes - Revision 1