There appears to be a ROCK AT THE bottom of the ocean what is that called?​

a rock

Explanation:

The sediments at the bottom of the ocean are clastic sediments, which are particles that have been eroded and broken down from other rocks and combined with a lot of organic material—skeletons, shells and other remains from creatures that either lived in the water column of the ocean or on the seafloor.    

Explanation:

If this isn't the answer then its probably patricks house.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.