Answer:
A. Obsidian
Explanation:
It fits the property described in the question.
It cools so fast that no visible crystal or grain could form. It has high silica Composition, black and glassy. It is also used to make tools with sharp edges
In this circumstance one should revise the hypothesis and develop a new experiment to test it.An example could be the theory of Agraham Gottloeb Werner that all rocks were precipitated from water including not just sedimentary rocks but also volcanic, plutonic and metamorphic rocks. The more the earth was studied, especially by James Hutton in Scotland, the more it became obvious that granites for example were deposited in a molten state, thus disproving that hypothesis or theory.
<span>The North American Trade Agreement (NAFTA), is an economic organization that implements policies for open trade between </span><span>Canada, United States, and Mexico. Through liberalization, the countries were able to have mutual benefits.
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</span><span>The three countries benefited from the trades through increase production, more jobs and better conditions in businesses.</span>
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The smallest country in Africa is Seychelles
