Which technology would be the most useful in predicting an eruption from an undersea volcano and why

As you move from right to left on the periodic table the atomic radius fill in the blank

What is the volume occupied by 10.0 dm3 of gas at standard pressure after it has been compressedat constant temputure to 500.0 kpa?

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption