If we will base our answer on Hertzsprung diagram, we
will see that mass and luminosity are directly related, which means, long lived
stars begin their lives with more mass and a larger amount of hydrogen fuel,
hence hydrogen is abundant before than now. They are more luminous during their
main sequence lives. Giant stars and supergiant
stars have great masses, so, they have greater luminosities.
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The atmosphere layer closest to the earth is referred to as the troposphere. Beyond the troposphere are the stratosphere, the ozone layer, the mesosphere, and the thermosphere. The atmosphere is made up of 78% nitrogen, 21% oxygen, and smaller amounts of argon, carbon dioxide, helium, and neon.
By pricing resources accurately, improving irrigation, redesigning product packaging. and reducing reliance on energy resources
The sun is our main resaurce of living in the earth without it we would die u like other
"Responsible travel to natural places that conserves the environment, supports the well-being of local people, and includes interpretation and education" is how ecotourism is characterized.
