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ElenaW [278]
3 years ago
5

Helium was discovered on earth years after it had been discovered on the sun.

Geography
1 answer:
Zinaida [17]3 years ago
3 0
The statement is true.
As weird as it may sound, helium was indeed first discovered on the Sun, and after some time on Earth. The first evidence of helium was observed on August 18 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the Sun's chromosphere. This line has been detected by a French astronomer by the name of Jules Janssen during a total solar eclipse in Gantur, India. 
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How are the land form of the eastern United States and Canada different from those of the western United States and Canada?
Marina86 [1]

The landforms on the east and western part of the continent are very different, with the main reason being that the western part is geologically very active, while the eastern lacks geological activity.

Explanation:

The eastern part of the United States and Canada, or rather the eastern part of the North American continent, is a region that lacks geological activity for millions of years. This region can roughly be divided into two parts, one being dominated by the Appalachian Mountain Range, and the other being the plains. The Appalachians are medium high mountains, being heavily eroded, with smaller slopes, and covered with dense forests. The plains stretch along the coastline, but they are also very wide, and move several hundred of km into the mainland, making big portion of this region flat lowlands.

The western part, on the other hand, is geologically very active. There are several young mountain ranges which are still growing. There is volcanic activity, faults, and plateaus between the mountains. The coastal plains are very small and narrow. Because of the shadow effect, between the mountains there are arid zones where deserts and steppes dominate.

Learn more about the effect of the Appalachian Mountains on the first European settlers brainly.com/question/4977910

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What does the future look like for water supplies, and what energy challenges does desalination face as a solution? (Site 1)
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Cuba is the largest island in the Caribbean Sea (also called the Antilles Sea), belonging to the Republic of Cuba.

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