How are volcanoes constructive vs. destructive?

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.