Earthquake sometimes occur when blank (a. a volcanic island moves away from a hotspot and it goes extinct, b. the solid rock layer in the lithosphere is no longer influenced by the more fluid asthenosphere, c. a transform boundary causes excessive amounts of friction between two tectonic plates, d. a divergent boundary abruptly reserves rolls to become a convergent boundary) some underwater earthquake shake the ocean floor in cause large sea waves that destroy property and threaten lives such as a sea wave is called blank (a. an avalanche, b. a tsunami, c. a tidal wave, d. a landslide)

Explanation:

Earthquakes occur on faults. A fault is a thin zone of crushed rock separating blocks of the earth's crust. When an earthquake occurs on one of these faults, the rock on one side of the fault slips with respect to the other. ... Faults can extend deep into the earth and may or may not extend up to the earth's surface.

what is this saying?

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.