Mon Prof Augmenté
Two Ocean Bulges
Open to everyone until Wednesday, September 30
To keep it, print it while it is open.
Earth spins once a day. A coastal place moves through two ocean bulges, so it gets two high tides and two low tides.
In the picture
- A coastal point on the globe: it sits inside an ocean bulge.
- An ocean bulge: a raised area of ocean aligned with the Moon.
- The Moon: it keeps the two ocean bulges lined up toward and away from it.
- The same coastal point half a turn later: it sits inside the opposite ocean bulge.
Examples
- A beach town sees the water climb the shore, then pull back, then climb again before night.
- A harbor’s boats float higher in the morning and again in the evening.
Key takeaways
- The Moon keeps two ocean bulges in line with it.
- One spin of Earth carries a coast through both bulges, giving two high tides and two low tides.
Carry on in the app
Three questions on this lesson, to check the idea stuck. Free in the app while the lesson is in the free week.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
Get the app
Free app, optional subscription
App Store Google Play
