Simplify the following text for a Grade 8 native English-speaking person.
Original: Other oxides are occasionally used , such as MnO2 in manganese thermite , Cr2O3 in chromium thermite , or copper ( II ) oxide in copper thermite , but only for highly specialised purposes .
Simplified: Chromium can be made by a thermite reaction between chromium ( III ) oxide and aluminium . The first uranium was made by a thermite .