When plate tectonics cause cracks to form,
a. scientists expect entire continents to fall into the earth.
b. volcanoes can occur.
c. a large rift usually remains and is never filled in.
d. most likely the country of mexico will separate from the continental united states

Renaldo and nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. when they test the electromagnet, it can pick up 6 paper clips. their teacher wants all groups to pick up at least 10 paper clips. what could renaldo and nasreen do to increase the number of paper clips their electromagnet picks up?