Salinity Levels in Different Bodies of Water

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What is the main reason for the variation in salinity levels in different regions?

Changes in ocean currents and wind patterns

Changes in the latitude belts and inland seas

Changes in the rate of rainfall and sunlight

Changes in the amount of evaporation and supply of fresh water (correct)

What is the effect of increased wind or sunlight on salinity levels?

Decreased salinity levels

No change in salinity levels

Variable salinity levels

Increased salinity levels (correct)

Which of the following bodies of water has the highest salinity level?

The Great Salt Lake

The Dead Sea

The Red Sea

Don Juan Pond in Antarctica (correct)

Why can people easily float on the water in the Dead Sea?

The salinity is high enough to change the buoyancy (D) Signup and view all the answers

What is the result of ocean currents mixing in the water column?

Variance in salinity levels (A) Signup and view all the answers

What pattern is observed in the distribution of salinity levels across different latitude belts?

Bands of similar salinity levels (D) Signup and view all the answers

Why is evaporating seawater to measure salinity not an accurate method?

Because some salts leave the water as it evaporates (B) Signup and view all the answers

What is the unit of measurement for salinity?

Grams per kilogram (B) Signup and view all the answers

What is the principle behind hydrometers?

The higher the salinity, the higher the density (A) Signup and view all the answers

Why are two readings needed when using a hydrometer to measure salinity?

To account for temperature changes (C) Signup and view all the answers

What is the purpose of the conversion scale in hydrometer measurements?

To interpret the salinity reading at the indicated temperature (C) Signup and view all the answers

What are the three types of meters that can be used to accurately measure salinity?

Refractometer, Salinometer, and Hydrometer (C) Signup and view all the answers

What is the primary reason why water is called the universal solvent?

It can dissolve a wide variety of substances, but not all (B) Signup and view all the answers

What is the term for the process of salt dissolving in water?

Dissolution (A) Signup and view all the answers

Which of the following layers of the ocean is characterized by the highest salinity?

Halocline (A) Signup and view all the answers

What is the primary driver of thermohaline circulation in the ocean?

Salinity differences (D) Signup and view all the answers

What is the term for the range of saline waters from fresh to brine?

Haline series (D) Signup and view all the answers

Why do freshwater fish need to drink water actively?

To compensate for water loss through their skin by osmosis (B) Signup and view all the answers

What is the primary function of the kidneys in fish that live in both fresh and saltwater?

To adapt to changes in water salinity (C) Signup and view all the answers

What is the chemical symbol for Sodium?

Na (C) Signup and view all the answers

What is the purpose of an estuary for some fish?

To lay or fertilize eggs (D) Signup and view all the answers

What is the term used to describe the measure of salt dissolved in water?

Salinity (D) Signup and view all the answers

Which instrument is used to measure the buoyancy of a liquid?

Hydrometer (A) Signup and view all the answers

What is the term for the separation of an ionically bonded molecule into two or more ions in solution?

Dissociate (C) Signup and view all the answers

Why do fish in seawater excrete excess salt via their gills and kidneys?

To maintain the balance of salt in their body (A) Signup and view all the answers

What is the primary reason why fish in seawater do not need to drink water actively?

They do not lose water through their skin (A) Signup and view all the answers

What is the term for the concentration of dissolved salt in a given volume of water?