If 19.9% of Boron is Boron-10 and 80.1% is Boron-11, what is the average atomic mass? 10.199 amu
O 10.233 amu
O 10.801 amu
O 11.245 amu

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the product of the pressure and volume is also constant

14 days is the half-life of phosphorus-32