Life in the sea

Question 1

What percentage of the world is ocean?

Answer 1

70

Question 2

What is average and max depth?

Answer 2

3794

11022

Question 3

What are the qualities of water?

Answer 3

Liquidity - bond by h bonds, means is a liquid at high temp
heat capacity - unusually high specific heat
Density
Light
Sound

Question 4

How much salt in sea water?

Answer 4

35 ppm average

Question 5

How does salinity change the properties of water?

Answer 5

Freesing point lowers to -1.89, density increase, when sea ice forms it extrudes salt, leaving saltier water beneath

Question 6

Why are the seas important?

Answer 6

Photoautotrophs in sea capture about 3% of suns energy, which is 24 000 times more than we use as a species

Question 7

what are the major types of marine photoautotrophs?

Answer 7

macrophytes, and phytoplankton

Question 8

What are macrophytes?

Answer 8

SEAWEED, BENTHIC, NEED TO BE ATTACHED TO SEABED, ARE RESTICTED TO SHALLOW ARES

Question 9

What are phytoplankton?

Answer 9

Very small and float so no coastal dependence, produce about half the oxygen in the atmosphere, reproduce quickly,

Question 10

What are the four classes of phytoplankton?

Answer 10

Cyanobacteria, Haptophytes, Dinoflagellates, Diatoms

Question 11

What are the problem s with phytoplankton?

Answer 11

Tend to sink, however nutrients also sink, however light is restricted to top levels, creating two layers

Question 12

How is the two layered dilemma overcome?

Answer 12

mixing of surface water by wind, coriolis effect, surface currents and upwelling of deep water

Question 13

What is Thermohaline Circulation?

Answer 13

Cold water sinks near the poles and moves towards the equator. Tropical water is lifted, mixed and welled towards the surface. At the surface it is heated and moves towards the poles. Creates conveyer belt

Question 14

How are organisms adapted to the two layered ocean?

Answer 14

Migrants or phenology