Unit 4B Oceans

Which ocean is located at number 4 in the picture?

• Atlantic

• Pacific

• Indian

• Southern

• Arctic

Which ocean is located between North America and Africa?

• Atlantic

• Arctic

• Indian

• Pacific

• Southern

Which ocean is located at number 3 in the picture?

• Atlantic

• Arctic

• Indian

• Southern

• Pacific

Which ocean is located between North America and Asia?

• Arctic

• Atlantic

• Indian

• Pacific

• Southern

Which ocean surrounds Antarctica?

• Atlantic

• Arctic

• Pacific

• Indian

• Southern

Which two salts are the most abundant in the oceans?

• calcium

• sodium

• chlorine

• magnesium

What is the average salinity of the world's oceans?

• 35%

• 3.5%

• 0.35%

• 1%

Which statements best describe why ocean water is so salty?

• flowing fresh water dissolves various minerals and carries them to the ocean

• water evaporates from the ocean, leaving the dissolved solids behind

• glaciers melt adding minerals to the ocean

• as marine animals die, their skeletons contribute to the ocean's salinity

Which of the following will DECREASE ocean salinity?

• glaciers melting

• rivers entering the ocean

• areas with a hot and dry climate

• heavy precipitation

Which of the following could increase the ocean's salinity?

• more water entering than evaporating

• more water evaporating than entering

• polar ice caps melting

• increased precipitation and little evaporation