Grains, fruits and vegetables were farmed in North America. The cultivation begin there at 5000 bp.
The tropical zones of North America grows oranges, sugar cane, banana and cocoa. Theses crops grow on humid mountains and coastal plains.
The total crops grew were more than $136 billion. This contributed 0.6% of GDP of America.
The total gross Domestic product of America is much high and agriculture crops amount to very small part but still it is one of n important source for economy.
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Rubber bands are different than many other materials because their molecules are actually very long chains, kind of like a tangled pile of spaghetti. These long chains are called polymers, which can behave in surprising ways when you heat or cool them. In this activity you will change the temperature of a rubber band using hot water and ice water, The rubber band actually expands when it gets colder! This seems counterintuitive because most materials expand when they are heated and contract when they get cold. This occurs because of the unusual polymer structure of rubber. When the long chains get hotter and vibrate, they actually shorten, causing the material to contract. When the chains cool down, they relax and stretch out, causing the material to expand.
Answer:
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