Earth Notes

Earth stands out because 70% is covered by water. The water is divided by continents 4 oceans. The largest is the Pacific Ocean. Atlantic is second largest and Indian is third and Arctic is last. 4.5 billion years ago there was not ocean. Volcanoes and others were there. Then it started to rain and the oceans came. Earth’s shape changed a lot over time. There is sodium collide in the ocean that’s why it is salty.  Measure of the amount of dissolved solids in a given amount of liquid is called salinity. Some parts of the ocean are saltier than others. Coastal water is hotter and drier climate have lower salinity. The water movement can affect the water salinity. Places with not many waves will have high salinity. The water temperature is different in December and July.  It’s if you are near the equator and also where the sun points. It depends on the time of the year. Earth is made out of 3 basic compounds water, land and clouds. All of these three things are in the water cycle. The water cycle is continuous movement of water. Evaporation, Condensation and Precipitation. Earth needs to keep suitable for life. Oceans holds energy from the sunlight. That functions temperatures in the atmosphere.