Ocean Water Quiz

Question 1

Freshwater can be obtained from seawater through a process called ____.

Accepted Answer

desalination

Question 2

In seawater, most of the ions (charged atoms) are made up of sodium and

Accepted Answer

chloride.

Question 3

Which statement best describes how ocean formation occurred in early Earth history?

Accepted Answer

massive volcanic outgassing of water vapor that cooled

Question 4

Ocean water is salty because of the extreme evaporation of water in the tropics.

Accepted Answer

FALSE

Question 5

A million years of torrential downpours caused the lowlands - or ____ - to fill up.

Accepted Answer

basins

Question 6

Over millions of years the water vapor cooled in early earth's atmosphere and

Accepted Answer

condensed into storm clouds & rained for a very long time.

Question 7

Salinity levels have been steady in Earth's oceans for the last billion years or so because

Accepted Answer

rivers replenish dissolved salts as they are being removed., some marine organisms help to remove dissolved salts.

Question 8

Oceans provide resources such as food, minerals,

Accepted Answer

transportation & weather.

Question 9

____ is the gas that almost all organisms need for respiration.

Accepted Answer

Oxygen

Question 10

Oceans affect weather & ____.

Accepted Answer

climate

Question 11

Today, about ___% of the Earth's surface is covered in oceans.

Accepted Answer

70

Question 12

Ocean currents keep some geographic areas warm and others

Accepted Answer

cool & foggy.

Question 13

Erupting volcanoes and the erosion of ____ carry dissolved salts into ocean water.

Accepted Answer

rocks & minerals

Question 14

Which statement best describes "salinity?"

Accepted Answer

the amount of dissolved salts per kilogram of seawater

Question 15

Dissolved salts in ocean water include

Accepted Answer

sodium, sulfates & calcium., calcium, magnesium & chloride.

Question 16

CO2 gas can also enter Earth's oceans from organisms when they respire.

Accepted Answer

TRUE

Question 17

CO2 gas enters the oceans from Earth's atmosphere.

Accepted Answer

TRUE

Question 18

Early asteroid & ____ bombardment may have also contributed to Earth ocean formation.

Accepted Answer

comet

Question 19

Some of the dissolved gasses in the oceans include

Accepted Answer

oxygen & CO2., CO2 & nitrogen.

Question 20

Salt is removed from the oceans when ocean evaporation occurs (leaving salt behind) and when

Accepted Answer

organisms such as clams, oysters & diatoms make shells.

Questions 20