How are individual atoms of oxygen formed in the stratosphere? a. Individual oxygen atoms are formed when oxygen molecules collide with each other.

b. Individual oXygen atoms are formed in the sun.

C. Individual oxygen atoms are formed during photosynthesis.

d. Individual oxygen atoms are formed when UV rays strike oxygen molecules.

THE ANSWERS TO THE WHOLE OZONE TEST 1.D 2.B 3.B 4. C 5.D 6.F 7.A 8.A 9.D 10.F

Sediment layers stop lateral spreading when: they encounter a barrier they encounter an opposing current they run out of additional sedimentary material

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

What molecule does hemoglobin decay into over time