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Explain how the characteristics of a river change as you travel downstream?

A number of river characteristics change as you travel downstream. Firstly, sediment size decreases due to erosion, which causes sediment to get finer and smoother. This happens due to hydraulic action, abra...
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Answered by Rosanna H. • Geography tutor
30446 Views

How do I form the pluperfect tense?

The pluperfect tense is used to describe an action that happened further back in the past - something you "had done". Here's an example: tu étais partie quand je suis arrivée (you had left when I a...
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Answered by Izzy V. • French tutor
2408 Views

Describe mechanisms used by the body to prevent entry of pathogens

Mucous in the trachea traps pathogens Microorganisms in food are killed by stomach acidThe skin forms a physical barrier against pathogens
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Answered by Obioma N. • Biology tutor
3022 Views

What is an infinitive verb?

An infinitive verb is essentially just the simplest form that a verb can be.It doesn't specify anything to do with who is completing the action; just the action itself.For example, in English we have infinit...
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Answered by Moira T. • Spanish tutor
2819 Views

Explain why atmospheric pressure decreases with increasing altitude. (3 marks)

Firstly, pressure is created by air molecules colliding with a surface. At an increased altitude there are fewer air molecules, and therefore a larger average distance between them. This means at this higher...
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Answered by Emily B. • Physics tutor
21394 Views