Separate Layer it's part of the "Atmosphere layers"
The correct answer is D. Decreased travel times.
The industrial revolution revolutionized the transport as well, so in this period we have the emergence of transporting machines, like the trains for example, and they were also getting better and better as the year passed by, and they were of great help to the people, especially when they had to travel on long distances.
This was due to the Czar Nicholas II, who led more of a dictatorship. In 1917, people rebelled, so the Czar stepped down.
optical telescope (Hubble), X ray telescope ( Chandra) etc.
get around the Earth's atmosphere so that we can get a clearer view of the planets, stars, and galaxies that we are studying.
Culture is what feels/is comfortable for a state, country, or city. There isn't an exact culture for all the people on this planet.
