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The upper atmosphere primarily consists of the thermosphere and exosphere, where the air is thin and composed mainly of hydrogen and helium, along with trace amounts of other gases. In contrast, the lower atmosphere, or troposphere, contains a higher concentration of gases, predominantly nitrogen (about 78%) and oxygen (about 21%), along with water vapor, carbon dioxide, and other trace gases. The composition varies with altitude, temperature, and atmospheric conditions in both layers.
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Why are there not many stars on the upper main sequence?
There are fewer stars on the upper main sequence because these stars have shorter lifespans compared to their lower-mass counterparts. High-mass stars burn through their nuclear fuel quickly, exiting the main sequence in a relatively short time, often in just a few million years. In contrast, lower-mass stars can remain on the main sequence for billions of years, leading to a greater abundance of them. Consequently, the upper main sequence is less populated due to the rapid evolution of high-mass stars.
How are stars on the upper left end of the main sequence different from those on the lower right end?
The main sequence is a map of star brightness against their temperature. Stars that lie on the main sequence in the top left are the high mass stars. Cooler, smaller stars lie near the line at the lower right.
What is the main gas in the mesosphere?
The main gas in the mesosphere is nitrogen, which makes up about 78% of the atmosphere. Oxygen is also present, constituting about 21%. In this layer of the atmosphere, both gases are found in lower densities compared to the layers below. The mesosphere extends from approximately 50 to 85 kilometers above the Earth's surface.
Why does it get colder when climbing up a mountain?
The main reasons are: There is lower air pressure, and there is lower air density. You do technically get closer to the sun, however the distance to the sun is so much greater that it doesn't really have an effect. So just those two reasons!
The H-R diagram of a young star cluster shows?
The H-R diagram of a young star cluster shows a main sequence stretching from upper left to lower right, where stars are fusing hydrogen in their cores. It also may include some young, pre-main sequence stars located above and to the right of the main sequence, which are still contracting and heating up. Additionally, there might be some high-mass, short-lived stars in the upper region of the diagram, and low-mass, long-lived stars in the lower region.
What are the main componets in mercury atmosphere?
Mercury has no significant atmosphere.
What are the five main parts of box and whisker plot?
lower extreme,upper extreme,upper quartile, lower quartile, and the median
What were the main uses of upper Egypt and lower Egypt?
farming
What are the main parts of a river?
The upper, lower and middle course.
What are the main chemistry componets of cells?
phosphoilpid
What are the main gases in earth lower atmosphere?
Nitrogen and Oxygen
What is the two main division of the respiratory system?
lower and upper respiratory system
What are the two main componets of sea water?
Hydrogen and Oxygen
What is the main difference between the upper peninsula and the lower peninsula?
The main difference between the Upper Peninsula and Lower Peninsula of Michigan is their geographical location. The Upper Peninsula is located to the north and is less populated with vast wilderness and natural beauty, while the Lower Peninsula is located to the south and is more densely populated with major cities like Detroit and Lansing.
Sequence of teeth eruption?
Primary (baby) teeth: A. the 2 lower central incisors +4 upper incisors B. upper and lower first molars (bicuspids) C. upper and lower cuspids (canine) D. upper and lower second molars Secondary (adult) teeth: A. upper and lower central incisors and first molars B. upper and lower lateral incisors C. upper and lower molars (bicuspids) D. upper and lower second molars E. upper and lower third molars (about 18 years old) Why? The theory is that the periodontal ligament provides the main way with the shrinking and cross-linking of collagen fibers.
What are the two main gases in the earth's lower atmosphere?
Nitrogen (which makes up about 78% of the atmosphere) and Oxygen (about 21%)
What are some factors of an ecosystem?
Main componets of an ecosystem are its Flora and Fauna
