The rate of photosynthesis in the pondweed is affected by different colours of light. Describe a method you could use to investigate this. You should include:

- what you should measure

- variables you would control

[6 marks]

Control intensity of lightUse a ruler to measure the distance of light from the beaker/pondweedVarying colour of light and use if different beakers gives a fairer result.Plant releases gas/oxygenMeasure number of bubbles/volume of gas producedSame length of timeDon't repeat but calculate a meanState the supply of Carbon Dioxide in Water

Explanation:

Hope it makes sense!

The real answer is

-cooling as the lava runs down the mountain

-melting of rocks to form magma underground