Earth has seasons because a. it rotates on its axis. b. the distance between earth and the sun changes. c. its axis is tilted as it moves around the sun. d. the temperature of the sun changes

what is the point of this site if you can literally use a calculator  

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.