Which gases in the following list exist as separate atoms: hydrogen, helium, nitrogen, oxygen, neon. Select one:
a. Hydrogen and helium
b. Helium and nitrogen
c. Helium and neon
d. Oxygen and nitrogen

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Which feature do highland climates have that lower elevation areas do not?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.