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1) River pollution can affect people, wildlife and the environment . 2) Loss of oxygen: River creatures and river plants need oxygen to survive. When raw (i.e. untreated) sewage enters a river system it is b...

1) In the lower course of the river the gradient is gentler than in the upper course. The river has more energy and the volume amount of water is high. 2) In the lower course there is more lateral (sideways)...

(5%) partially molten, low rigidity/plastic/rheid, allows the movement of the plates and mostly composed of peridotite

Precision and simplicity are what GCSE exam boards are looking for. You only have to look at the mark schemes to realise that it is very much a checking systen - there are specific points which the examiner ...

The cardiac cycle is what happens during a single heartbeat. To understand the cycle it helps to know that the heart is made up of four chambers, the top 2 chambers are called the atria and the lower 2 chamb...