Question

PLEASE HELP!!!!! WILL GIVE MEDAL!!!! AND FAN AND GIVE TESTIMONIAL!

Answer 1

@armine @HelpBlahBlahBlah @Gokuporter @Grazes @JamesWolf @Jackchappell @help?!?!?!

Answer 2

anyone

Answer 3

@FireWolfSpirit

Answer 4

hello

Answer 5

56

Answer 6

For the first question, the half life is 28 yrs. The strontium begins with 100% of radioactive element. 1/2 of 100 is 50. 28 passes and the element remaining is 50%. Then, another halflife occurs to make the percent 25% and you see that another 28 years has passed.

idk about the others earth science questions though. It's been too long.

Answer 7

ok do you know #2 and #3?

Answer 8

oh i see what you said at the bottom thanks for the first one!