Which of the following statements about the impact of surface and underground mining of minerals is correct?
a. underground mining is just as disruptive to the surface as strip and open-pit mining.
b. precipitation seeping through piles of waste rock taken from strip and open pit mines can dissolve toxic metals and other chemicals that can then flow into nearby rivers and streams.
c. strip and open-pit mining disturbs large areas of earth’s surface.
d. all of the above

ocean expansion, global warming is melting icebergs and causing water levels to rise.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.