Sea Level! What is it and how do scientists calculate it? As it turns out, there are actually many complexities in determining this measurement. For example, Earth isn’t actually a sphere, gravity is stronger and weaker at different points around the globe, and of course, there are a lot of mountains that are no where near water — so how do we know what sea level would be? In this video, Minute Physics explains the details.
From educator Scott Gass, artist Sandro Katamashvili, and TED Ed, How Big Is the Ocean? Watch this primer for understanding an incredibly large, important, and singular part of our planet Earth.
While the Earth’s oceans are known as five separate entities, there is really only one ocean. So, how big is it? As of 2013, it takes up 71% of the Earth, houses 99% of the biosphere, and contains some of Earth’s grandest geological features. Scott Gass reminds us of the influence humans have on the ocean and the influence it has on us.
Overfishing—catching fish faster than they can reproduce—is an urgent and devastating issue, and may be the single biggest threat to ocean ecosystems… The global fishing fleet is operating at 2.5 times the sustainable level—there are simply too many boats chasing a dwindling number of fish.