I will mark brainliest. pls help my grade depends on this
Why are rivers and oceans both barriers and roadways?

Explain the connections between North and South America.
Compare and contrast the Amazon and Mississippi rivers
Evaluate the effect of physical geography on human culture.
Identify the major geographic and cultural features of Central and South America.

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.

The correct answer is:   [b]:   "distortion" . 

The answer would be a.