1. Where is the origin of the major deep oceanic currents? a) the Pacific Ocean;

Question

1. Where is the origin of the major deep oceanic currents?
a) the Pacific Ocean; b) the Atlantic Ocean; c) the Circumpolar Sea; d) the Indian Ocean;
e) the Mediterranean Sea

2. Waves are refracted by the topography of coastlines. Which of the following is (are) possible:
a) longshore currents; b) rip currents; c) decrease of wave energy in bays;
d) increase in wave energy along points; e) any of these are possible

3. During the full moon and new moon periods:
a) the sun, moon and earth form a right angle and you get spring tides;
b) the sun, moon and earth form a right angle and you get neap tides;
c) the sun, moon and earth are in alignment and you get spring tides;
d) the sun, moon and earth are in alignment and you get neap tides;
e) the sun the earth and moon are in the seventh house and you get the age of Aquarius

4. A group (population) of interbreeding organisms that has the potential to produce fertile offspring, and is reproductively isolated from other groups (populations), is called:
a) a biological community; b) an ecosystem; c) a niche; d) a trophic level; e) a species

5. Major oceanic surface gyres are:
a) caused by global winds; b) large circular system of ocean surface currents;
c) affected by the Coriolis effect; d) all of these; e) none of these

6. Today we have a full moon with a specific type of tide. What kind of tide will we have approximately two weeks from today?
a) semi-diurnal tide; b) spring tide; c) neap tide; d) lunar tide; e) mixed tide

7. What is a tsunami? Why do most of these occur in the Pacific? (Open question.)

Explanation / Answer

1. The oceans of earth are characterised by Thermohaline circulation. Warm oceanic water (in Indian, Pacific, Atlantic oceans) from equatorial regions moves towards the poles. From this water at the poles, ice starts to form and as result, the remaining water becomes excessilvely salty and so its density increased. This cold, denser water originating from the polar seas like circumpolar sea will move towards the equator by occupying the deeper regions of the oceans.

The answer is c) the Circumpolar sea.

2. When waves strike the coastline at an angle, longshore currents form which moves parallel to coastline.

Rip currents can form when two longshore currents meet and as it move away from the foreshore along the sea bottom, so it is also called Bottom hugging current.

Wave decreases in bays because gradually sea depth decreases and the wave loses its energy.

When waves hit the headlands and any irregular points of coastline, the wave energy gets concentrated there and thus increasing the energy.

So, all of the above are happen so the answer is e) any of these are possible.

3. When sun, earth and moon occur in a straight line, the moon at this stage is called New moon.

When sun, moon and earth occur in a straight line, the moon at this stage is called Full moon.

In both Full moon and New moon, tidal attraction is greatest and the tide is called Spring Tide.

So the answer is c) the sun, moon and earth are in alignment and you get spring tides.

4. The species term is used when,

- a group of organism interbreeds among themselvers

- seperated from other group of organism by certain barriers

- produces fertile offspring

So, the answer is e) a species.

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