Write a note on Eartha
Answers
Answer:
Earth is a planet in solar system located at third position around 150 million Kilometres away from Sun.
Earth is the third planet from the Sun and the only astronomical object known to harbour and support life. About 29.2% of Earth's surface is land consisting of continents and islands. The remaining 70.8% is covered with water, mostly by oceans, seas, gulfs, and other salt-water bodies, but also by lakes, rivers, and other freshwater, which together constitute the hydrosphere. Much of Earth's polar regions are covered in ice. Earth's outer layer is divided into several rigid tectonic plates that migrate across the surface over many millions of years, while its interior remains active with a solid iron inner core, a liquid outer core that generates Earth's magnetic field, and a convective mantle that drives plate tectonics.
Explanation:
The globe was built with a scale of 1:1,000,000, on which one inch represents sixteen miles.[2][3] As most globes, it is mounted at a 23.5 degree angle, the same axial tilt as the Earth itself; thus the equator is diagonal to the floor. It uses a cantilever mount with two motors, and simulates one day's revolution and rotation every 18 minutes, though it is possible for the motors to fully rotate the globe in as little as one minute.[citation needed]
The globe was completed in 1998[2] after two years of construction and planning,[3] and it uses a composite database built from satellite imagery, shaded relief, colored bathymetry, and information about road networks and urban areas. The database used to generate the surface images was approximately 140 gigabytes.[citation needed]
While former CEO of DeLorme Maps, David DeLorme, is credited with the design of the globe, Lewiston-based surveyor and civil engineer, Vincent J.P. Leblanc, was involved in the building project.[4] Map technician Jeff Clark was "responsible" for each of the 792 plastic sections that cover the rotating globe.[3]
Eartha is contained in an atrium with several glass walls that allow it to be seen from outside of the building; it is readily visible from U.S. Route 1. At night, the globe is illuminated.[5]
Eartha is constructed around a truss structure which is called Omni-Span, and consists of over 6000 pieces of aluminum tubing. This is covered by a skin of 792 map panels, each covering 8 degrees of latitude and 10 degrees of longitude, and attached to the trusses with a custom-designed system of hidden bolts.[citation needed