Heterogeneous mixture is a substance that does not have a chemical formula and has more than one fase and the examples are water and oil because of the two different colors of fases, italian dressing is also another example because it has more than one different colors of fases.
Answer:
Some plains form as ice and water erodes, or wears away, the dirt and rock on higher land. Water and ice carry the bits of dirt, rock, and other material, called sediment, down hillsides to be deposited elsewhere. As layer upon layer of this sediment is laid down, plains form. Volcanic activity can also form plains.