6. which statement best describes an igneous intrusion? a. magma explodes to the surface and forms a smooth outer layer of rock. b. igneous intrusions form when ice crystals splash into lava. c. magma is exported to an open area and forms iron. d. magma is injected into surrounding rock forming an igneous intrusion.

The correct answer is option D, that is, magma is injected into surrounding rock producing an igneous intrusion.  

Magma refers to a semifluid or fluid substance within or underneath the crust of the Earth from which the formation of lava and other igneous rocks takes place by cooling. Igneous intrusion produces when the magma from beneath the Earth's surface is gradually pushed up to occupy the cracks or spaces between the rocks and solidifies and cools down prior of reaching to the Earth's surface.  

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

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