One we have to make time to do something which we can use simple machines
Two we have to be creative in order to finish the task
the black night was great
The expansion of deeply buried rocks after they are exposed by erosion causes the formation of Fractures which reduce the strength of the rock.
Fractures along which rock has slipped relative to the other side are called faults, whereas fractures that are simple cracks where the rock has pulled apart by a small amount are joints. Any fracture or system of fractures along which Earth moves is known as a fault. Faults allow the blocks to move relative to each other which results to an earthquake.
When deeply buried rocks are uncovered by erosion, the removal of weight allows them to relax and expand. Produces fractures and increases in porosity. This stress-relaxation process reduces the strength of rocks, opening up passageways/storage places for water to attack and further weaken the rocks.
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Chemical weathering would be the oxygen reaction.
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.
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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).