What describes the general phenomenon of tides?

What describes the general phenomenon of tides?

• A. The regular rise and fall of the ocean's surface influenced by the moon's gravity pulling on earth
• B. Water bulges toward Moon
• C. The time at which the tide reaches its lowest level
• D. Sun and Moon are aligned; strongest

Answer: (A)

Tides are the regular rise and fall of the ocean surface caused by the Moon’s gravity pulling on the Earth. The Moon’s gravity is stronger on the side of Earth that is closest to it, creating a bulge toward the Moon, while inertia creates a second bulge on the opposite side. As Earth rotates, different coastal areas move into and out of these two bulges, producing high and low tides. The Sun also exerts gravitational pull, which can amplify tides when it and the Moon align, but the basic phenomenon is the Moon’s gravitational effect on Earth’s oceans. The statement about water bulging toward the Moon captures part of the idea but misses the second bulge on the far side. The mention of the lowest-tide time refers to a moment in the cycle, not the overall phenomenon. The note about alignment of Sun and Moon describes a condition that makes tides stronger, not the general process.

Tides are the regular rise and fall of the ocean surface caused by the Moon’s gravity pulling on the Earth. The Moon’s gravity is stronger on the side of Earth that is closest to it, creating a bulge toward the Moon, while inertia creates a second bulge on the opposite side. As Earth rotates, different coastal areas move into and out of these two bulges, producing high and low tides. The Sun also exerts gravitational pull, which can amplify tides when it and the Moon align, but the basic phenomenon is the Moon’s gravitational effect on Earth’s oceans.

The statement about water bulging toward the Moon captures part of the idea but misses the second bulge on the far side. The mention of the lowest-tide time refers to a moment in the cycle, not the overall phenomenon. The note about alignment of Sun and Moon describes a condition that makes tides stronger, not the general process.