16 Questions
What are the two main types of regular movements in the oceans?
Horizontal and Vertical movements
What percentage of the Earth's surface do the oceans occupy?
More than 70%
What causes the regular rhythmic motion of tides?
Gravitational attraction exerted upon the Earth by the Sun and the Moon
How do the oceans affect the Earth's surface?
They surround all land masses
What are the two main causes of the regular movements in the oceans?
Density and winds
What exerts a strong gravitational pull on the Earth, causing the formation of tides?
The Moon
What causes high tides to occur later each day?
The Moon's gravitational force pulls the water of the Earth nearest to the Moon.
What are spring tides and when do they occur?
Spring tides occur when the sun, the moon, and the earth are in a straight line, resulting in higher tide heights.
What is perigee and when does it occur?
Perigee is the point at which the Moon is closest in its orbit to the Earth, occurring around 1st January when the Earth is nearest the Sun.
What is a neap tide and when does it occur?
A neap tide is a period of moderate tides that occurs seven days after a spring tide, when the sun, moon, and Earth are at right angles to each other.
What are the effects of tides on coastlines and salt production?
Tides help destroy coastlines, form creeks and inlets, and shape low-lying areas for salt production.
What role do tides play in the lives of fishermen?
The rhythm of high and low tides controls the lives of fishermen, who sail out and return with the tide.
How can tidal energy be harnessed?
Tidal energy can be harnessed to produce electricity.
What are ocean currents?
Ocean currents are the regular movement of water from one part of the ocean to another.
What are the main factors that determine the circulation pattern of ocean currents?
The main factors are prevailing winds, the shape and position of landmasses, and the depths of oceans.
What causes the circulation pattern of ocean currents?
The circulation pattern is mainly caused by the difference in density of seawater and variation in temperature.
Test your knowledge about the Earth's surface, continents, and oceans. Learn about the distribution of land and water on our planet.
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