Fa sample of material is heterogeneous, then it must be

an element

a mixture

a pure substance

a compound
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This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.

What diagram shows the ionic compound of magnesium oxide

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining