Extrusions are formed by cooling magma beneath earths surface.

true or false

False.

Extrusions rocks are formed above the surface of earth, they are also known as volcanic rocks as they are formed by slow cooling of lava at or above the surface of the earth. These are intrusive rocks which are formed by entering of magma to an underground chamber, where it cools very slowly resulting formation of a large crystal of rock.

Therefore, the given statement is false.

The answer is false (:

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.