They occur in patterns because certain features are formed at the site of the three types of plate boundaries.
On the earth there is the top layer dirt then loam comes next
<span><span>Mn<span>O<span>2<span>(s)</span></span></span>+<span>H<span>2<span>(g)</span></span></span>→Mn<span>O<span>(s)</span></span>+<span>H2</span><span>O<span>(g)</span></span></span></span>
B ice melting hope it helps