Why there are two tides a day – level 2
16-04-2025 07:00
The Moon and the Sun cause tides on Earth. The Moon pulls on Earth’s water, making it rise in two places – on the side closest to the Moon and on the opposite side.
As the Earth spins, different areas move into these bulges. This causes two high and two low tides every day.
The Sun also affects tides. When the Sun and Moon are in line, we get stronger tides called spring tides. When they are at an angle, we get weaker tides. Some places have bigger tides than others depending on the shape of the land.
Other planets and moons have very strong tides, too. One moon of Jupiter, called Io, even has volcanoes because of tides. One day, Earth may always face the Moon, but that will take billions of years.
Difficult words: spin (to turn around), bulge (a rounded swelling of a flat surface), angle (the space between two lines or surfaces at the point at which they touch each other).
You can watch the original video in the Level 3 section.
How does Earth's spin influence the way tidal bulges from the Moon and Sun affect different regions, and what factors determine whether tides are stronger or weaker?
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