Crest
Trenches, or deep sea trenches.
close reading
Both have their trouble areas. With trombone, it's all about developing muscle memory to find the correct slide positions. With horn, what gets tricky is close partials in the overtone series, where the same fingering can be used for many notes, or one note can be played several different ways.
The region of a compressional wave where particles are close together is called the compression zone. In this zone, particles are crowded closely together, creating areas of high pressure.
Water
Low-laying areas close to water are at risk of flooding
These waves are called sound waves. Sound waves are mechanical waves that travel through a medium, such as air or water, in the form of compressions (areas where particles are close together) and rarefactions (areas where particles are spread apart).
Areas that are close to sea level elevation.
Usually - land
Areas in Pennsylvania close to Lake Erie have more moderate temperatures than areas away from it. That is, it doesn't usually get as cold in the winter or as hot in the summer close to the lake.
In the areas close to the equator, yes.
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