WILL GIVE BRAINLIEST

4. For A it's 0.6×10^9 years as that's when the mass percent reached 50%.

For B it's 4.5 × 10^9 years as that's when mass% reached 50%.

For C it's 13 × 10^9 years.

For D it's not visible on the graph. But it'll take at least another 14 × 10^9 years to reach half life.

5. A has the shortest half life since it took it less time to deplete to half of it's original mass percent.

6. A is unstable because it has the shortest half life and this means it'll take it very fast to decay.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.