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
A. Eclipses only occur during full and new moons.
Answer:
The first contribution of this study is to provide measures of within-country differences in. well-being across ethnic groups, defined as "ethnic inequality." To overcome the sparsity of income. data along ethnic lines and in order to construct country-level indicators of ethnic inequality for.
Explanation:
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Answer:
taking data from a population rather than a specific group of people to gather information from
(random and most representative on a large scale of people)