abi weathering

Weathering : 

Weathering Weathering is the breakdown of rock “in situ” (where it is) Erosion involves taking away and further breaking down rock as it moves. There are four main agents of erosion Rivers (fluvial), Sea (waves), Glaciers, Wind Task: Use this presentation as a base to add your own text and diagrams when asked for. When you have finished upload it to a share site such as slideshare or authorstream, get the embed code and place it in your eportfolio.

Types of Weathering : 

Types of Weathering Physical Chemical Biotic Freeze-Thaw Exfoliation (onion-skin) Carbonation oxidation Plant roots Animals burrowing

Freeze-Thaw : 

Freeze-Thaw Other images Explanation: Otherwise know as frost shattering, this happens in colder climates when the temperatures are around freezing point and where exposed rock with many cracks. Water enters the rock during the warmer days and then during the colder nights the water will freeze. When the water in the rocks freezes, it expands and causes pressure on the surrounding of the rock. When the temperature rises, then the ice in the rock melts and the pressure is released. Because this takes place so often, pieces of the rocks could brake off.

Exfoliation (Onion skin) : 

Exfoliation (Onion skin) Description and Explanation: Occurs in warmer climates. Non-vegetated rocks are constantly heated and cooled. The surface layers of the rock heats up faster in the days and cool and contract in the inner layers in the nights, this will cause stresses within the rock and this will cause the layers to peel off.

Biological : 

Biological This is when the roots of plants break up rocks as they grow. Burrowing animals can also break up the soil and rocks. Snails also have an effect. Just look at the trails they leave on walls. The main impact is that by aerating the soil they allow other agents to directly weather the parent rock which is under the soil. The breakdown of dead plants also releases an acid called humic acid and this is important in the breakdown of rock. This occurs especially in hot humid tropical areas, however it is normally associated with Chemical Weathering.

Chemical : 

Chemical 1. Oxidation is when oxygen in the air reacts with chemicals in the rock. The most important is when iron in rocks in one form called ferrous oxide (FeO) combines with oxygen to form the soluble Ferric oxide (Fe2o3). This is basically rust and leads to red soils. This happens a lot in tropical areas also.

Carbonation – Limestone areas : 

Carbonation – Limestone areas Describe and explain the situation here:

Climate and Weathering : 

Climate and Weathering Research the average annual temperature and precipitation of Barbados. Note what it is here and describe what type of weathering occurs here.

Next : 

Next We will be looking at the limestone landscape of Barbados and comparing it to other limestone landscapes worldwide. What is the role of limestone in shaping some of the features we have Caves, underground streams, gulleys, Humans and the limestone environment