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Describe the formation of mineral deposits at hydrothermal vents

Hydrothermal vents form where cold seawater percolates down into the Earth's oceanic crust, and is superheated by the geothermal gradient. Under the confining pressure of the surrounding rock and the overlyi...
CB
Answered by Chris B. • Geology tutor
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Expand the quadratic equation and simplify: (3a+4)(a-1)

To expand brackets you should multiply each term with every other term. Here it would be: 3a 2 -3a+4a-4 Collecting the a terms, this simplifies to: 3a 2 +a-4.
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Answered by Ran D. • Maths tutor
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What is the difference between "future simple" and "futur proche"?

The "future simple" tense is used when one wants to describe an action that will take place sometime in the future. In English, we use "will" or "shall" + a main verb, for eg: I...
AP
Answered by Alexandra P. • French tutor
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Explain the process of synaptic transmission (6 marks).

When the action potential reaches the pre-synaptic knob, voltage gated Ca 2+ channels open which allows Ca 2+ into the pre-synaptic knob - This causes vesicles which contain neurotransmitter such as acetylch...
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Answered by Dominic H. • Biology tutor
11415 Views

Contrast facilitated diffusion and active transport

Since the key word is contrast infomation about both facilitated diffusion and active transport is needed. Facilitated diffusion does not require ATP whereas active transport does require ATP Facilitated dif...
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Answered by Daniel S. • Biology tutor
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