25K views · 2.5K reactions | There’s more to the ocean than meets the eye. Internal tides — underwater tides caused by the Moon’s gravitational pull — may only appear a few inches high but can extend hundreds of feet below the water’s surface, where they play a role in moving heat through our climate system. | NASA Earth | Facebook

566K views · 5.8K reactions | We can't prevent the damage caused by earthquakes, but we can reduce the number of casualties. See how. | National Geographic | Facebook