Question

Hep with a couple of questions please? Thanks!
When is the best time to clean up a chemical spill in the lab?
1:
a)immediately after it happens
b)at the end of your investigation
c)at the end of the day, just before going home
d)none of the above

2:
How is a sieve used in earth science investigations?

a)in particle-size analysis

b)to identify minerals

c)to break rocks apart

d)as part of predicting weather