What was the primary motivation for the draining of lake beds in Mexico City? A. to reduce the risk of flooding B. to prevent the spread of diseases C. to protect the city from invaders D. to mine for gold under the lake beds   

I think that it is D thanks hope it helps

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.

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