What causes the breakdown of the ozone layer? select one: a. chlorine and bromine in chloroflourocarbons b. chlorine and flourine in chloroflourocarbons c. hydrogen and bromine in hydroflourocarbons d. hydrogen and flourine in hydroflourocarbons

What are some of the problems that hurricanes cause?

What is the difference between emigrate and immigrate? ?

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?