What would most likely happen if the carbon dioxide in earth's atmosphere were reduced to half?
a. earth's surface would become cooler
b. the ozone layer will become thicker
c. there would not be enough oxygen to breathe
d. earth's air pressure would increase dramatically

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.