1.Reduce the number of trips you take in your car.
2.Reduce or eliminate fireplace and wood stove use.
3.Avoid burning leaves, trash, and other materials.
4.Avoid using gas-powered lawn and garden equipment.
Answer:
11. On the diagram of the area of sand dune development attached to the answer, draw a sketch showing the general side view of a sand dune formed by a wind blowing in the direction indicated. Your sketch should clearly show any variations in the slope of the sides of the dune.
[1] Allow 1 credit for a correct profile, showing both the windward and leeward sides of the same dune, and showing the steepest gradient on the leeward side. Acceptable responses include, but are not limited to, this example:
12. Allow 1 credit for a correct response. Acceptable responses include, but are not limited to, these examples:
The calcite cement would be chemically weathered and removed by infiltrating water.
It would be dissolved.
It will bubble.
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).