Can you elaborate? There's no text or anything.
<u>Heating process</u> is a process that causes sand grains to stick together to form sandstone.
An oligopoly is a market structure in which the market is shared between a few firms, this few firms sell identical or differentiated products , and the industry has significant barriers to entry.
The automobile industry considered an oligopoly because there are few leading auto manufacturers which are having significant influence over the industry. All these firms sell identical products. And the last characteristic of an oligopoly is also there: it is very hard for a firm to entry this market because production costs are huge.
Answer:
A, B, and D.
Explanation:
The correct answer is option A, B, and D.
Astronomical telescope is a device which is used to observe distant heavenly bodies like stars, planets,sun,satellites, and etc.
when the size of the lens decreases the chromatic aberration is minimized.
Large astronomical telescopes are reflectors because chromatic aberration is minimized, they are shorter in size and they are also not heavy.
