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water droplets that combine with one another, grow too heavy to stay in the air, and fall to the ground as snow, rain or hail.
the movement of particles from an area of higher concentration to an area of lower concentration...
the process whereby carbon is turned into carbohydrates in plants, and becomes available as an...
organisms that use dead organic material as a food source and thus recycles them.
a solid that forms as a product of the reaction between two aqueous solutions.