weathering in barbados

Views:
 
Category: Education
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

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 When water seeps into cracks in the rocks, which are found at high altitudes, and then becomes frozen overnight. As the water freezes the molecules expand, this expansion further widens the crack. Then during the day the ice melts, and then the cycle is started again that night.

Exfoliation (Onion skin) : 

Exfoliation (Onion skin) In extremely hot places of the world, such as the deserts of Africa, rocks will be heated to such a degree in the sun, that during the night the molecules in the top layer become so dense due to the massive temperature drop; that their outermost layer peels off.

Biological : 

Biological Bonus points if you actually take one of the photos that you insert on this page 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. Once again. .. Look for rocks with red streaks in them or even soils and this will show evidence of oxidation. Original photos will get you bonus points

Carbonation – Limestone areas : 

Carbonation – Limestone areas Describe and explain the situation here: Rain is slightly acidic, due to the fact that it’s molecules react with carbondioxide, creating carbonic acid. This acidic rain falls down upon the limstone, the calcium carbonate, and then the two compounds react with each other creating calcium bicarbonate; which is soluble in water and is washed away in the process- Chemical Weathering

Climate and Weathering : 

Climate and Weathering The average annual temperature of Barbados is 26.0 degrees Celsius and precipitation is 1413 mm. We are on the border of strong chemical and moderate chemical weathering.

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, gullies Humans and the limestone environment

What is the role of limestone in shaping some of the features we have? : 

What is the role of limestone in shaping some of the features we have? Limestone is permeable and becomes soluble within water after a couple of compounds create. Since the island exerts massive pressures outward from the center, it creates cracks within the stone which only become bigger as the rock gets washed away in the rain. Certain formations are created such as gullies, caves and underground rivers.

authorStream Live Help