Question

1. which gas is most important for marine animal respiration?

a. carbon dioxide
b. nitrogen
c. oxygen
d. helium

1. tides are mainly caused by

a. wind energy
b. earths core heat
c. gravitational pull of the moon and sun
d. ocean currents

1. when the sun, moon, and earth are in a straight line,______tides occur

a. neap
b. spring
c. diurnal
d. mixed

1. the time between two consecutive high tides is about

a. 6 hours
b. 12 hours 25 minutes
c. 24 hours
d. 48 hours

1. waves are produced mainly by

a. wind blowing over the surface
b. earths rotation
c. seismic activity
d. temperature differences

1. the size of a wave depends partly on the fetch, which is

a. the distance the wave travels
b. the distance the wind blows over open water
c. the depth of the ocean
d. the temperature of the sea

Explanation:

1. All animals, including marine animals, need oxygen for respiration. Carbon dioxide is a waste product of respiration. Nitrogen and helium are not used in respiration.
2. Tides are mainly caused by the gravitational pull of the Moon and Sun on the Earth's oceans. Wind energy causes waves, not tides. Earth's core heat is related to volcanic activity and plate tectonics. Ocean currents are caused by factors like wind, temperature, and salinity differences.
3. When the Sun, Moon, and Earth are in a straight line, spring tides occur. Spring tides have a larger tidal range. Neap tides occur when the Sun and Moon are at right angles to each other relative to the Earth. Diurnal and mixed tides refer to the pattern of tides (one high - tide per day or a combination of different tidal patterns) rather than the alignment of the Sun, Moon, and Earth.
4. The time between two consecutive high tides is about 12 hours 25 minutes. This is because the Moon, which has a major influence on tides, takes about 24 hours 50 minutes to complete a cycle relative to a point on the Earth's surface. So, the time between two high tides (half of this cycle) is approximately 12 hours 25 minutes.
5. Waves are mainly produced by wind blowing over the surface of the water. Earth's rotation causes phenomena like the Coriolis effect which influences ocean currents but not the main cause of waves. Seismic activity can cause tsunamis (a special type of wave), but most common waves are wind - generated. Temperature differences can cause ocean currents, not waves.
6. The fetch is defined as the distance the wind blows over open water. A longer fetch generally allows the wind to transfer more energy to the water, resulting in larger waves. The distance the wave travels is related to wave propagation but not the fetch. The depth of the ocean affects wave behavior (e.g., wave breaking) but not the fetch. The temperature of the sea is not related to the fetch.

Answer:

1. C. Oxygen
2. C. Gravitational pull of the Moon and Sun
3. B. Spring
4. B. 12 hours 25 minutes
5. A. Wind blowing over the surface
6. B. The distance the wind blows over open water