Saturday, September 21, 2019
What is tide and how it occurs?
Tides are the rise and fall of sea levels caused by the gravitational pull of the moon and, to a lesser extent, the sun, on Earth's oceans. Tides occur due to the gravitational attraction between the Earth and these celestial bodies, causing the water in the oceans to bulge in the direction of the moon and the sun. This gravitational force creates a tidal force, resulting in the phenomenon we observe as tides.
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| What is tide |
How Tides Occur:
1. Gravitational Pull: The moon exerts a gravitational pull on Earth, attracting the water in the oceans toward it. Simultaneously, the Earth is attracted toward the moon, creating a high tide on the side of the Earth facing the moon.
2. Centrifugal Force: As Earth rotates, there is a centrifugal force pushing water away from the center of the Earth. This force creates a bulge on the side opposite to the moon, resulting in another high tide, known as the "opposite tide."
3. Sun's Influence: The sun also exerts a gravitational pull on Earth, causing a similar effect, although its influence is weaker compared to the moon's. When the gravitational pull of the sun aligns with that of the moon (during full moon and new moon), it results in higher high tides, known as spring tides. When the sun's pull is perpendicular to the moon's (during the first and third quarters of the moon), it results in lower high tides, known as neap tides.
4. Gravitational Interaction: The combined gravitational effects of the moon and the sun create a gravitational gradient across the Earth, leading to the movement of ocean water, causing the rise and fall of tides.
Types of Tides:
1. Spring Tides: Occur during the new moon and full moon phases when the gravitational forces of the moon and the sun align, resulting in higher high tides and lower low tides.
2. Neap Tides: Occur during the first and third quarters of the moon when the gravitational forces of the moon and the sun are perpendicular to each other, resulting in lower high tides and higher low tides.
Tides play a vital role in shaping coastal environments, affecting marine life, navigation, and various human activities near coastlines. The regular cycle of tides is a natural and predictable phenomenon influenced by the gravitational interactions between Earth, the moon, and the sun.