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Earth--The Facts

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11. Posted by mikeyBoab (Travel Guru 5077 posts) 10y

This is quite an informative thread. Anyone got other cool facts?

We could start a similar thread for people statistics.

12. Posted by Jase007 (Travel Guru 8870 posts) 10y

The Earth is divided into several layers which have distinct chemical and seismic properties (depths in km):

0- 40 Crust
40- 400 Upper mantle
400- 650 Transition region
650-2700 Lower mantle
2700-2890 D'' layer
2890-5150 Outer core
5150-6378 Inner core

13. Posted by mikeyBoab (Travel Guru 5077 posts) 10y

Yes Jase, and the crust varies considerably in thickness, it is thinner under the oceans, thicker under the continents. The inner core and crust are solid; the outer core and mantle layers are plastic or semi-fluid. The various layers are separated by discontinuities which are evident in seismic data; the best known of these is the Mohorovicic discontinuity between the crust and upper mantle.

14. Posted by Jase007 (Travel Guru 8870 posts) 10y

Cool Mikey,
There are (at present) eight major plates:

  • North American Plate - North America, western North Atlantic and Greenland Plate boundaries Earth's Plate Boundaries delineated by earthquake epicenters
  • South American Plate - South America and western South Atlantic
  • Antarctic Plate - Antarctica and the "Southern Ocean"
  • Eurasian Plate - eastern North Atlantic, Europe and Asia except for India
  • African Plate - Africa, eastern South Atlantic and western Indian Ocean
  • Indian-Australian Plate - India, Australia, New Zealand and most of Indian Ocean
  • Nazca Plate - eastern Pacific Ocean adjacent to South America
  • Pacific Plate - most of the Pacific Ocean (and the southern coast of California!)
15. Posted by mikeyBoab (Travel Guru 5077 posts) 10y

Don't forget Jase, there are also twenty or more small plates such as the Arabian, Cocos, and Philippine Plates. Earthquakes are much more common at the plate boundaries. Plotting their locations makes it easy to see the plate boundaries.

16. Posted by Jase007 (Travel Guru 8870 posts) 10y

very true.
Why is the sky blue?

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

17. Posted by mikeyBoab (Travel Guru 5077 posts) 10y

The Facts About Earth Day

Earth Day is a great day to spend with your kids and remind them about the environment and how important it is to celebrate Earth Day every day of the year.

Date of Earth Day:

Earth Day is always observed on April 22. International Earth Day is celebrated on the March equinox

Reason We Celebrate Earth Day:
To call attention to the environment.

History of Earth Day:

Former U.S. Senator Gaylord Nelson was Earth Day's co-founder.
The first Earth Day was in April 22, 1970.
Senator Nelson got the name after reading about San Fransisco's Earth Day celebration which was held on March 21, 1970.
Observance of Earth Day:

Take notice of the planet Earth
Take care of the Environment
Stop and Smell the Roses on Earth Day

International Earth Day is said to be the original Earth Day and celebrated on the March equinox (March 20-21).
The UN peace bell is rang three times to mark the day and a minute of silence is followed.
John McConnell was the founder of Earth Day and was supported by UN Secretary-General U Thant. The first International Earth Day celebration on March 21, 1971.

[ Edit: Edited at Aug 25, 2006 8:17 AM by mikeyBoab ]

18. Posted by magykal1 (Travel Guru 2026 posts) 10y

'Earth' is the only planet in the multiverse that is an anagram of 'heart'. ahhh.

19. Posted by s_hoot (Respected Member 497 posts) 10y

Sound travels about 5000 feet per second through the ocean, thats 3 times faster than through the air.

If a tree falls in the middle of the forest and no one is around to hear it, does it make a sound?

20. Posted by mikeyBoab (Travel Guru 5077 posts) 10y

Quoting s_hoot

If a tree falls in the middle of the forest and no one is around to hear it, does it make a sound?


It was not until the time of Copernicus (the sixteenth century) that it was understood that the Earth is just another planet.

What came first, the chicken or the egg?