If two pieces of ocean crust meet at a convergent boundary, which piece tends to curl under and back into the mantle Older crust
Or
Younger crust

Which layer surrounds the center of the earth? a: crust b: core c: mantle

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail

What is the carrying capacity of an ecosystem for a given population? a. the total number of species in the ecosystem b. the total number of predators in the ecosystem c. the minimum population size in that ecosystem d. the maximum population size in that ecosystem