The answer is d. particles move from an area of high concentration to low concentration.
Arenal Volcano: Plate Tectonic Setting. The volcanic arc of Costa Rica, where Arenal is located, is a chain of mountains resulting from the subduction of the Cocos tectonic plate under the Caribbean Plate. Costa Rica is part of the Central American isthmus, which connects the North and South American continents.
There are two valence electrons in a single atom of magnesium.
<span>Decomposition reaction.</span>
I think it's 534 grams per cubic centimetre