Underlying rock structures ​

adj You describe something as underlying when it is below the surface of something else. ... hills with the hard underlying rock poking through the turf...

Explanation:

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the cordillera states and grand canyon are along the southwest u.s. and northern mexican pacific.

the great plains and southwest desert are also the prairie and home to many earthquakes too .

the coastal plains have poor soil and many factories started in the south.

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the answers for the whole quick check is

1. b

2. b

3. a

4. c

5. b

6. a

7. d