Agraph of coal reserves in the united states versus time slopes downward. this indicates that coal production could have a. stayed the same b. decreased c. increased d. fluctuated i think it is c.

Need will mark ! which features are created by groundwater erosion and deposition? check all that apply. a. stalagmitesb. sinkholesc. rillsd. stalactites e. gullies f. rivers

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Long term exposure to waves can cause sunburns and skin cancer.