If a rock has 500 atoms of a parent and 3500 atoms of daughter product, how many half lives have passed?

1 half life

2 half lives

3 half lives

4 half lives

there is no way to tell

Answer the collision of tectonic plates;

Icant awnser the qustion bc u have the planets not listed

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.