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Oceanic crusts are forced beneath the continental crust at a subduction zone because they are denser. Heat produced by friction turns the sinking oceanic plate into magma. This then tries to reach the sur...

The grana is made up of stacked thylakoid membranes which give a larger surface area upon which the photosystems and chlorophyll can trap light energy. The space within the membrane stack allows proton mo...

One advantages of hormonal contraception are that, when used properly i.e. taken on time and regularly, they are more effective than physical barrier contraceptives such as condoms or diaphragms. However ...

'Describe' questions are looking for historical, contextual, knowledge - tailored specifically to the question.For example the examiner will have hundreds of papers to mark and they are looking for specif...

Hydrogen fuel cells are really important as they can be used to power electrical cars, so it's something that a lot of scientists are looking into at the moment. We need to balance this equation, so we ne...