When looking at a hand sample of an igneous rock, how would you ...

[penza]

When looking at a hand sample of an igneous rock, how would you tell if it is plutonic or volcanic? What will be an ideal response?

Question 2

Briefly explain batholith formation. What will be an ideal response?

[Bison]

Answer to Question 1

ANS:If
the texture is phaneritic, the magma cooled slowly, and the rock is plutonic. If the texture is
aphanitic, the magma cooled rapidly, and the rock is volcanic.

Answer to Question 2

Most batholiths appear to have formed by upward intrusion of magma accompanied by fracturing and
stoping, and the shouldering-aside and deformation of intruded country rock.

[penza]

Wow, this really help

[Zebsrer]

Thanks for the timely response, appreciate it