What is the scientific term for rocks formed from lava? extrusive

rhyolite

intrusive

gabbro

Intrusive is the Scientific term for rocks formed from lava.

A. Extrusive.

Explanation: Extrusive rock is the formation of volcanic rock involving an igneous process with hot magma, which is possible because this magma comes out of the inner Earth, and this phenomenon is called extrude, which is why extrusive rock is so named.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.