What is the superposition of strata theory? a. that rock strata has been laid down for 4.6 billion years

b. that sedimentary rick is composed of bits of rock eroded minerals

c. that oldest layers of sediment in rock formations are found under more recent layers

d. that the earth is composed of a core, mantle, and crust

C. That oldest layers of sediment in rock formations are found under more recent layers

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c