A wooden boat plank from a prehistoric site has a carbon-14 activity of 5 counts per minute (cpm). New wood has a carbon-14 activity of 40 cpm. Carbon-14 has a half-
life of 5730 years. What is the age of the wooden boat plank from the prehistoric
9
site?
A/
years

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

What is the largest environment on earth?

How does science use models to gain a better understanding of concepts?