Look for grains cemented together, they can usually be rubbed off easily. It's easily friable and layered due to deposition. It's earthy so it'd be pretty dull and have no crystals whatsoever. etc.
The amplitude of a wave is a measure of the amount of energy it carries.
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South America is a continent in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. It may also be considered a subcontinent of the Americas, or America,[6][7] which is how it is viewed in Spanish and Portuguese-speaking regions of the Americas. The reference to South America instead of other regions (like Latin America or the Southern Cone) has increased in the last decades due to changing geopolitical dynamics (in particular, the rise of Brazil).
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