Over time all the water either evaporates or gets absorbed into the soil. Or both.
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The O stars is the most luminous, then B, then A, F, G, K, and M stars are the least luminous_____ there must be a relationship between mass and luminosity.
If the coast-to-coast distance is about 2900 miles, it will take about ...
... (2900 mi)/(186000 mi/s) ≈ 15.6 ms
for the signal to travel coast-to-coast at light speed.
_____
There are time delays due to the amplifiers and repeaters required in the path, and due to the fact that the signals don't actually travel at the speed of light in a wire.
A test of internet speed between Seattle and Washington, DC shows a round-trip time of about 87 ms when traffic is light. Modern communication channels tend to be faster than the telegraph (especially when measured in words per minute).
Answer: The answer is D: international recognition
International recognition is generally not a reason why humans compete for territory.
Explanation: Territory can be defined as an area under the control of a specific individual or country. It is an area of land belonging to a governmental authority. It is also an area of land belonging or connected with a country or a person.
International recognition is an official recognition or acknowledgement of a person by other country.