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Explain the processes involved in the formation of a waterfall. (6 marks)

A waterfall is an erosional landform, which occurs where there is a layer of hard rock on top of a layer of softer rock. Erosional processes such as hydraulic action and abrasion occur as the river flows dow...
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Answered by Hannah C. • Geography tutor
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Find the roots of the equation y = 2x^2 + 5x + 2.

The root of an equation is a point where, when the equation is plotted on a graph, it crosses the x axis. The x axis is the line y = 0, so the roots can be found by setting 0 = ax 2 + bx + c where a,b and c ...
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Answered by Will U. • Maths tutor
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What is the photoelectric effect?

The photoelectic effect is when photoelectrons are released from a metal that light is incident upon. The photoelectrons are only emitted when the photons of light are above a certain threshold frequency and...
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Answered by Gemma R. • Physics tutor
2598 Views

What happens to the diaphragm during inspiration?

Diaphragm contracts which causes it to move downwards/become flatter
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Answered by Will H. • Biology tutor
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Name 2 products formed by burning fossil fuels which cause harm to the environment.

Carbon dioxide causes global warming which consequently leads to enhanced melting of polar ice caps and rising sea levels. Carbon particles lead to formation of smog which blocks out sunlight and causes dimm...
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Answered by Sophie C. • Chemistry tutor
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