<span>If a modern astronomer describes a faint star as being in the constellation cygnus, the swan, you know that the star is: </span><span>Somewhere within a particular region of sky having definite boundaries
</span>The swn of the constellation cygnus is located on northern part of the constellation. This means that the location is limited to the plane part of the milky wat.
Answer:

Explanation:
thickness of aerosol layer is 2.5 km
zenith angle is 40 degree
we know that

where

is extinction coefficient
extiction cross section
N = Concentration





transimiitance 


<span>An extended period of well below average rainfall known as a drought.
If this keep happening, a drought will eventually cause massive shortages in water supply.
Massive shortages in water supply will eventually cause in a decrease of population of various plants and animals</span>
<u>Answer:</u>
The "Tian Shan" is a great resource for iron, coal and lead mining.
<u>Explanation:</u>
- The Tian Shan that is located in the central part of Asia is a huge system of various mountain ranges that are said to have formed in the Pliocene period, about '7 to 2.5 million' years ago.
- It is spread over an area that is 2500 kilometers long and about 500 kilometers wide.
- The Tian Shan hosts numerous deposits of coal, iron, and lead.
The structure of its houses and the many farms around the mountainside