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Describe and explain the formation of a gorge - 6 marks

Waterfalls often form when hard (e.g. granite) and soft (e.g. clay or chalk) rock are present , where water flows across the harder rock and drops onto softer rock. The falling water then starts to form a pl...
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Answered by Josh A. • Geography tutor
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Why does as an excess of nutrients such as nitrates lead to animal death in bodies of freshwater?

This is an unexpected result as usually nutrients are considered beneficial to organisms. Some organisms do benefit enourmously from the nutrients, but this leads to the deaths of other. The high concentrati...
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Answered by Daniel A. • Biology tutor
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Consider an isosceles triangle ABC, where AB=AC=1, M is the midpoint of BC, and <BAM=<CAM=x. Use trigonometry to find an expression for BM and by finding BC^2, show that cos2x = 1 - 2(sinx)^2.

Consider the right-angled triangle BAM. We have the hypotenuse and an angle, and want to find the opposite side. Therefore, using SOHCAHTOA, sinx = BM/1, hence BM = sinx. Because M is the midpoint of BC, BC ...
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Answered by Blessie S. • Maths tutor
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Write a persuasive article on why students should or shouldn't have to wear school uniform

Uniform. The bain of our lives as students. What does it achieve? Oppression. Regimentation. Suppressing our freedom to express ourselves. Teachers and schools insist that as students we should strive to be ...
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Which type of electromagnetic radiation has the longest wavelength?

Radio waves
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