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-Hydraulic action of the water erodes the banks of the river

-Small pieces of sediment carried by the river erode the banks via abrasion

-River beds and banks are erodes through corrosion ca...

The derivative of a function f(x) is a measure of how the function f changes as its variable x changes. You have already met an example of derivatives: the gradient, m,...

Sketching trigonometric graphs is all about working from the graphs you already know and seeing how they behave when added/multiplied/substracted from each other to sketch more complicated functions.

The best way to ensure a clear focus on the question throughout your essays is to plan beforehand. I like to make sure I have written 4-5 points on a scrap of paper, along with a link back to the question...