1(a)Define physical weathering. (b)Describe three processes of physical weathering. (c)(i)Explain two factors that accelerate the rate of weathering in equatorial areas. (ii)Explain three significance of weathering to human...

      

1(a)Define physical weathering.
(b)Describe three processes of physical weathering.
(c)(i)Explain two factors that accelerate the rate of weathering in equatorial areas.
(ii)Explain three significance of weathering to human activities.
(d)You are planning to carry out a field study on weathering in the area around your school.
(i)State two ways you would prepare for the study.
(ii)Give three chemical weathering processes you are likely to study.
(iii)What follow-up activities would you be involved in after the field study?

  

Answers


Seline
1(a)It is disintegration of rocks without any chemical processes being involved/breaking of rocks without alteration in its chemical composition.
(b)Frost action - It occurs when water freezes in cracks, its volume increases exerting pressure on the crack breaking it.
Slaking - It occurs when clay rocks receive a lot of water hence the rocks expand. When they lose the water during dry season the rocks shrink and break.
Crystal growth - As water moves up cracks through capillary dissolved minerals crystalline within the cracks. Pressure builds up within the crack breaking it.
Pressure release/Off loading - When underlying rocks are exposed through wide spread erosion the rocks expand and disintegrate.
Block disintegration - When a block of rock I'd exposed to intense heat during the day the minerals expand, at night the rock cools hence contract this continuous process breaks the rock.
Exfoliation - When the rock surface is exposed to intense heat the minerals on the surface expand while the underneath minerals remain cool. This continuous process eventually cause stress which peels off the rock.
(c)(i)High temperatures which increase the rate of chemical decay of rocks.
High rainfall which increase the rate of chemical weathering hence rocks minerals are dissolved forming thick soils.
The rainforests add a lot of organic matter into the soil increasing the chemical and biological weathering.
(ii)Weathering forms deep fertile soils which aid Agriculture.
Weathering forms granitic rocks that attract tourists.
Weathering weakens rocks which make it easy for mining/produce blocks for building and construction.
Weathered products such as clay and bauxite are used as source of minerals for industries.
(d)(i)Conducting a reconnaissance/pre-visit of the area of study to familiarize yourself before actual field study.
Seeking permission from relevant authorities.
Assembling the relevant equipment for the study.
Holding discussions in class about the study.
Preparing a work schedule.
Dividing into groups.
Reading about the topic from secondary sources.
(ii)Solution.
Carbonation.
Hydrolysis.
Oxidation.
Hydration.
(iii)Writing reports.
Displaying photographs/items collected.
Asking/answering questions.
Discussing with the rest of the class.
Analysis/assessing the information collected against the hypothesis.
Drawing diagrams.
Belan answered the question on March 2, 2019 at 20:20


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