World Ocean Day: photos; tide info; rip tide danger; oceans' oxygen contribution

[Panich52]

EarthSky

Your best ocean photos

Thank you for these beautiful images, in celebration of World Oceans Day 2015!



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Tides, and the pull of the moon and sun

The sun and moon, shape of a beach, angle of a seabed and prevailing ocean currents, and the winds, all affect the height of the tides.

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Video:  Perpetual ocean

A beautiful video visualization of ocean currents around the world.

NASA: Perpetual Ocean

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How much do oceans add to world's oxygen?

Most of Earth’s oxygen comes from tiny ocean plants – called phytoplankton – that live near the water’s surface and drift with the currents.

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Video: Rip currents #1 danger for beach-goers

These currents can flow faster than humans can swim.  If you're going to the beach this summer, this is one video you and your kids need to watch.

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[niyad]

1. thank you.

[Human101948]

2. Yes...I got caught in a rip current and did exactly the wrong thing...

In a panic I swam as hard as I could against the current. I was totally exhausted and close to giving up when my toes dug into the sand underneath giving me enough grip to struggle onto shore. One of the scariest moments of my life.