Physical properties define the appearance of that substance.
Answer:
They learned because they keeped studying they would never give up and if they found something new or interesting they may have just studied it more.
Explanation:
The answer would be A: its container.
Gas will expand to fill whatever container it is put in.
Erosion is the wearing away of rock and soil found along the river bed and the river banks. Erosion also involves the breaking down of the rock particles that get carried downstream by the river. the rocks start to wear off and break down slowly.
Through the vibration of particles in a medium.