"The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya.<span> <span>Wikipedia."
https://www.google.com/search?q=He+Silurian+period+occurred&rlz=1C1RUCY_enUS760US760&oq=He+Silurian+...
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The most abundant fossil fuel is coal... Coal isn't only our most abundant fossil fuel,it's also the one with perhaps the longest history. The U.S. has more coal reserves than any other country in the world. In fact, one-fourth of the all the known coal in the world is in the U.S.
Answer:
1. If developed due to the practice of farming, cultivation of the soil for the growing of crops. Similarly, individuals have learned how to use animal to provide food, wool, and other necessities.
2. Obviously, the practice of agriculture is essential in sustaining human life. However, these practices often leave negative impact on the environment. The most prominent of these effects includes climate change, deforestation, pollution, and other unfortunate events.
3. This is due to the fact that different areas harvest different crops, evidently leading to various different foods.
4. Agriculture differs in those regions for developing ones evidently don't have as much experience as those that are already established. It will take a deal of time for them to develop similar foods as the other already developed regions.
5 + 6 Don't know.
