their density is less than the density of the their surroundings or their is a force acting upon them
Buoyancy is the force that causes things to rise or float in a fluid, such as water or air. This force is exerted in the opposite direction to the force of gravity, making objects appear to be lighter when submerged in a fluid.
what causes the motion of objects
the objects that are buoyancy are the objects that have the force to rise or to float in any way.
Yeast is the ingredient used in baking that causes the dough to rise.
Carbon dioxide
The gravitation
Gravity is the force that causes objects to have weight. Gravity is the attraction between two objects with mass, such as the Earth and an object on its surface, that causes objects to be pulled towards each other. The strength of gravity depends on the masses of the objects and the distance between them.
Yeast.
drugs
The sudden vibration in the plates inside the crust causes the earths crust to rise & fall.
Force is the only thing that causes the accelerationof material objects, whether they're moving or not.
The yeast consumes the natural sugars in the dough and causes bubbles to form. This causes the dough to rise. It's being blown up by the yeast.