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Flashcards in Ocean Zones Deck (23):
1

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

Epipelagic, Mesopelagic, Bathypelagic, Abyssopelagic, Hadalpelagic

2

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

Interaction with the wind keeps this layer mixed.

3

The thermocline is:

The decrease in temperature with depth.

4

The thermocline begins at the bottom of the _____ zone

Epipelagic

5

The epipelagic zone extends from the surface to ___ meters.

200

6

The mesopelagic zone extends between 200 meters and ____ meters.

1000

7

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

Sunlight at this depth is very faint

8

The bathypelagic zone extends from 1000 meters to ___ meters.

4000

9

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

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

10

The abyssopelagic zone extends from 4000 meters to ___ meters.

6000

11

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

10911

12

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

95

13

Halocline is the change in ______ with depth.

Salinity

14

The carbonate compensation depth is defined as:

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

15

Nautical charts denote depths in units of fathoms.
About how many meters are equal to 100 fathoms?

183 meters

16

Most primary production occurs within the _______ zone.

Epipelagic

17

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

Aphotic

18

Which ocean zone contains over 75% of the total
volume of the world’s oceans?

Abyssopelagic

19

Pressure under water increases 1 atm every __ meters.

10

20

The demersal zone is located:

near the coast and at the seafloor

21

Open ocean is the _____ zone

Pelagic

22

The pelagic zone can be separated into different subzones by _____

Depth

23

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

The Epipelagic, Mesopelagic, Bathypelagic, Abyssalpelagic, and Hadalpelagic