Thunderstorms and high clouds
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Answer:
a. They must be present in a large geographic area.
Explanation:
Index fossils can be used to determine the age of a rock strata with great precision, but they must be scattered over a large geographic area to be able to be used reliable for this type of measurement. Index fossils typically indicate a certain type of paleoenvironment belonging to a very specific prehistoric period and their formation coincides with the age of the rock layer.
Based on geographical analysis, the pair of B countries that share a border is "<u>Brazil and Bolivia</u>."
<h3>Where are Brazil and Bolivia?</h3>
Both Brazil and Bolivia are located in South America continent.
Bolivia is located in the west of Brazil.
Brazil is surrounded by countries like Paraguay, Uruguay, Peru, Bolivia, Colombia, Venezuela, among others.
Hence, in this case, it is concluded that the correct answer is option B. Brazil and Bolivia.
Learn more about geographical location here: brainly.com/question/12790602
Explanation:
step 1. let called the acute angles inside the triangle <1 and <2.
step 2. <2 +140 = 180 (supplementary angle)
step 3. <2 = 40°
step 4. <1 + <2 + 90 = 180. (interior angles of a triangle = 180°)
step 5. <1 + 40 = 90
step 6. <1 = 50°
