What evidence shows the area that is now the Grand Canyon was under a sea several times? *igneous rock from volcanoessedimentary rock made of the shells of sea creaturesmetamorphic rocklayers of rock of different colors

sedimentary rock made of the shells of sea creatures

Explanation:

The examination of the sedimentary rocks on the Grand Canyon in the Grand Canyon National Park reveals that the age of this canyon is about 200 million old. These were found deposited in the warm and shallow seas. These were found in the western North America. The examination of the sedimentary rocks revealed that these were composed of the calcium shells of the sea animals.  

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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    -sprinkles

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.