Which is more dense, cold freshwater or warm seawater? Explain.

The most abundant salt in seawater is a. calcium chloride. b. magnesium chloride. c. sodium chloride. d. sodium fluoride

Solve each problem.

A couple planning their wedding has found that the cost to hire a caterer for the reception depends on the number of guests attending. If $100$ people attend, the cost per person will be $\$ 20$. For each person less than $100$, the cost will increase by $\$ 5$. Assume that no more than $100$ people will attend. Let $x$ represent the number less than $100$ who do not attend. For example, if $95$ attend, $x=5$.

Write a function defined by $N(x)$ giving the number of guests.

Where did the water that makes up Earth's oceans originally come from? (A) Water vapor as part of the original atmosphere. (B) Water vapor dissolved in molten rock. (C) Liquid water came from beneath Earth's surface and from comets. (D) Liquid water settled into low areas of the surface.

Suggest A recent study showed a 30 percent decrease in phytoplankton concentrations in northem oceans over the last 25 years. How might a significant decrease in marine phytoplankton affect atmospheric levels of oxygen and carbon dioxide?

Illustrate the three layers into which ocean water is divided based on temperature.

Why is the surface salinity of the ocean higher in the subtropics than in equatorial regions ?

What is the most abundant salt in seawater? How do salts enter the ocean?

Specify Where did the water in Earth's early oceans originate?

What is oceanography? What was learned from the Challenger expedition?

What is a salt? Give two examples of salts

Relate What evidence indicates that oceans formed early in Earth's geologic history?

Reason Why do some scientists theorize that global warming might not be the result of increases in atmospheric carbon dioxide?

Identify What factors affect the chemical properties of seawater?