Question

What property of matter allows convection currents to form? A. Fluids rise if they are less dense than the matter around them. B. The molecules in solids do not vibrate very quickly. C. Electromagnetic waves carry energy. D. Liquids take the shape of their container.

Answer 1

Answer: Option (A) is the correct answer.

Explanation:

When a fluid is heated then cold material (more dense) sinks at the bottom whereas hot material (less dense) rises at the top. Due to this mixing of materials there is formation of current which is known as convection current.

Thus, we can conclude that fluids rise if they are less dense than the matter around them is the property of matter that allows convection currents to form.

Answer 2

A
Convection currents are formed due to the density difference between layers of fluid. The heated layers rise up because their density is less than that of the colder layers.