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What is a surd? How would you go by simplifying a surd?

A surd is an irrational square root which cannot be reduced to a whole number when squared. When you think of the square root of 4, the answer is 2. When you think of the square root of 9, the answer is 3. H...
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Answered by James O. • Maths tutor
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Outline the process of eutrophication

Eutrophication occurs when nitrate fertilisers are carried by ground water into lakes and ponds. The fertliser encourages algal growth in the water, which in turn blocks out sunlight. This causes submerged p...
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Answered by India G. • Biology tutor
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Coal is a fossil fuel and in constant debates for its negative impacts on the environment. Which elements does it consist of and which products are being formed when it is burned? Give two examples for the effects on the environment.

(a) Coal contains Carbon (80%) Sulfur (9%) Oxygen (5%) Hydrogen (1%) other elements (5%) (b) Carbondioxide (CO2) Sulfurdioxide (SO2) Water (H2O) (c) Carbon dioxide: Global warming (green house effect) Sulfur...
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Answered by Thea P. • Chemistry tutor
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Discuss the relative importance of human and physical causes of desertification. [15 marks]

Desertification is the expansion of dry desert conditions into areas that previously had not experienced them. This is characterized by lower soil productivity and a depletion of natural resources. There are...
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Answered by Oliver S. • Geography tutor
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What should I include in my personal statement?

The key question you need to have in your mind when writing your personal statement is: “Why me?”Admissions officers want to know if you are the type of person who could contribute to their Universities in t...
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Answered by Muna R. • LNAT tutor
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