Industrial smog is: a. associated with photochemistry
b. is principally associated with coal burning industries
c. a relatively recent phenomena which started in the 1970s
d. principally associated with transportation

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?

What is the best evidence for the plate tectonics?

Which of these scenarios is most similar to the aztec empire's system of agriculture? a. a farmer plants the same crops b. a farmer observes the behavior c. a farmer watches the sun’s patterns d. a farmer plants many different crops