Ocean Zones

Question 1

The ocean can be categorized into different zones by depth. These zones in descending order are:

Answer 1

Epipelagic, Mesopelagic, Bathypelagic, Abyssopelagic, Hadalpelagic

Question 2

The epipelagic zone distributes the heat from the sun vertically because:

Answer 2

Interaction with the wind keeps this layer mixed.

Question 3

The thermocline is:

Answer 3

The decrease in temperature with depth.

Question 4

The thermocline begins at the bottom of the _____ zone

Answer 4

Epipelagic

Question 5

The epipelagic zone extends from the surface to ___ meters.

Answer 5

200

Question 6

The mesopelagic zone extends between 200 meters and ____ meters.

Answer 6

1000

Question 7

The mesolpelagic zone is also known as the twilight zone because:

Answer 7

Sunlight at this depth is very faint

Question 8

The bathypelagic zone extends from 1000 meters to ___ meters.

Answer 8

4000

Question 9

The bathypelagic zone is also known as the midnight zone because:

Answer 9

The only light here (and deeper) comes from bioluminescence.

Question 10

The abyssopelagic zone extends from 4000 meters to ___ meters.

Answer 10

6000

Question 11

The hadalpelagic zone extends from 6000 meters to ___ meters (the bottom of the Marianas Trench.)

Answer 11

10911

Question 12

The mesopelagic zone contains approximately __% of the world’s fish biomass.

Answer 12

95

Question 13

Halocline is the change in ______ with depth.

Answer 13

Salinity

Question 14

The carbonate compensation depth is defined as:

Answer 14

The water depth at which the rate of supply of calcium carbonate from the surface is equal to the rate of dissolution.

Question 15

Nautical charts denote depths in units of fathoms.

About how many meters are equal to 100 fathoms?

Answer 15

183 meters

Question 16

Most primary production occurs within the _______ zone.

Answer 16

Epipelagic

Question 17

The _____ zone is formally defined as the depths beyond which less than 1% of sunlight penetrates.

Answer 17

Aphotic

Question 18

Which ocean zone contains over 75% of the total

volume of the world’s oceans?

Answer 18

Abyssopelagic

Question 19

Pressure under water increases 1 atm every __ meters.

Answer 19

10

Question 20

The demersal zone is located:

Answer 20

near the coast and at the seafloor

Question 21

Open ocean is the _____ zone

Answer 21

Pelagic

Question 22

The pelagic zone can be separated into different subzones by _____

Answer 22

Depth

Question 23

The subzones, listed from shallowest to deepest, of the pelagic zone are:

Answer 23

The Epipelagic, Mesopelagic, Bathypelagic, Abyssalpelagic, and Hadalpelagic