🌊 Why Earth Has Tides
Tides happen because gravity pulls on Earth’s oceans unevenly. Two celestial players are involved:
🌕 1. The Moon’s Gravity (the main cause)
The Moon pulls on Earth, but it pulls more strongly on the side facing it and less strongly on the far side.
This difference creates two bulges of water:
- One on the side facing the Moon
- One on the opposite side
As Earth rotates through these bulges, coastlines experience two high tides and two low tides each day.
☀️ 2. The Sun’s Gravity (a strong backup)
The Sun also pulls on Earth’s oceans.
When the Sun, Moon, and Earth line up (new moon or full moon), their gravity combines to make extra‑strong tides called spring tides.
When they’re at right angles (first or third quarter moon), they produce weaker tides called neap tides.
🌍 3. Earth’s rotation keeps the cycle moving
Earth spins once every 24 hours, so different places move into and out of the tidal bulges, creating the regular rise and fall of sea level.