1. Oceanography - Study of Earth's oceans Ocean Currents
Water Temperature
Water Chemical Composition
Seafloor Sediments and Topography
Marine Life

2. A. The Blue Planet
~ 71% of the Earth is covered by oceans; 61% in the northern hemisphere and % in the southern hemisphere
97% of water found on Earth contained in the oceans
Average depth is 3800 m
Sea level has risen/fallen by hundreds of meters because of melting ice, thermal expansion, expanding glaciers, and tectonic forces

3. B. Seawater
% water and 3.5 % dissolved salts such as NaCl, Cl, Mg, K, Ca + dissolved gases + dissolved nutrients
Salinity = measure of the amount of dissolved salts in seawater (ppt)
Can vary in location; higher in areas with greater evaporation, medium in areas with greater precipitation, lowest in polar areas because of dilution by melting ice

4. c. Weathering of rocks/minerals ex. feldspar
3. Sources of salinity
a. Water vapor
b. Volcanic gases
c. Weathering of rocks/minerals ex. feldspar
Removal of Salt
a. Waves/sea spray can deposit salts inland
b. Marine organisms use salt for homes (shells), found in bones and teeth. Decomposition then returns the salts used.