Write For Us

Why Earth Has Two Levels

E-Commerce Solutions SEO Solutions Marketing Solutions
223 Views

  • Thanks! Share it with your friends!

    You disliked this video. Thanks for the feedback!

AVA
Published
Get NordVPN at . Use code MINUTEEARTH to save 77%!
Earth’s outer shell is made of two materials whose different densities and thicknesses give rise to two distinct “levels” on the planet’s surface.
Watch our new show Paradigms (U.S. servers only!):
Thanks also to our Patreon patrons and our YouTube sponsors.
___________________________________________
To learn more, start your googling with these keywords:
Hypsometric Curve: Basically, a chart that shows the proportions of surface area at every elevation on a planet.
Crust: Earth's outermost layer, made out of two distinct materials – oceanic crust (which is denser) and continental crust (which is less dense).
Lithosphere: The rigid outer layer of Earth, including the crust and the hard, un-bending part of the upper mantle.
Subduction: The process of an ocean plate crashing into another plate and getting forced to dive down into Earth's mantle.
Isostasy: Describes the way earth's crust sort of floats in the underlying mantle. Continental crust is less dense and thicker, and floats higher than the oceanic crust, which is denser and thinner. Geologists talk about things like "isostatic rebound," which is what happens after an ice age, when the ice melts off a continent and the continent lifts up, like a floating raft in a pool after someone gets off (though continents rise more slowly).
___________________________________________
Subscribe to MinuteEarth on YouTube:
Support us on Patreon:
And visit our website:
Say hello on Facebook:
And Twitter:
And download our videos on itunes:
___________________________________________
Credits (and Twitter handles):
Script Writer: Emily Elert (@eelert)
Script Editor: Alex Reich (@alexhreich)
Video Illustrator: Ever Salazar (@eversalazar)
Video Director: Emily Elert (@eelert)
Video Narrator: Emily Elert (@eelert)
With Contributions From: Henry Reich, Kate Yoshida, Peter Reich, David Goldenberg
Music by: Nathaniel Schroeder:
___________________________________________
References:
Albarede, F. (2009) Volatile accretion history of the terrestrial planets and dynamic implications. Nature, Vol 461.
Calogero, Meredith. Personal Communication, 2018.
Eakins, B.W. and G.F. Sharman. Hypsographic Curve of Earth's Surface from ETOPO1, NOAA National Geophysical Data Center, Boulder, CO, 2012
from:
Hawkesworth, C. J. & Kemp, A. I. S. (2006) Evolution of the continental crust. Nature, Vol 443.
Rosenblatt, P.C , & Thouvenot, P.E. (1994). Comparative hypsometric analysis of Earth and Venus. Geophysics Research Letters, Vol 21, pp 465-468.
Stern, R.J., Gerya, T, & Tackley, P.J. (2018) Stagnant lid tectonics: Perspectives from silicate planets, dwarf planets, large moons, and large asteroids. Geoscience Frontiers, 9.
Category
Success
Sign in or sign up to post comments.
Be the first to comment