#1: when you heat an air-filled balloon, what happens inside with regard to the movement of air molecules? a. the collisions of air molecules against the wall of the balloon are weaker. b. the collisions of air molecules against the wall of the balloon are stronger. c. the collisions of air molecules against the wall of the balloon do not change. **my b is that right? ? @aaronq : )

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

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

Name the element in group 17, period 2. (periodic table)