Which statement does NOT describe subduction zones? A.
Earthquakes and volcanoes occur at these boundaries.

B.
Old crust is recycled into Earth's mantle.

C.
Volcanic mountains can form at these boundaries.

D.
New crust forms by seafloor spreading

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver