Question text
20 A glass beaker contains water. When the centre of the base of the beaker is heated, a convection current is set up. glass beaker convection current water heat Which statement explains this? A The evaporation of water causes water molecules to rise to the surface. B The expansion of water molecules causes them to rise to the surface. C The water above the heat source rises because it becomes less dense. D The water at the side falls because it becomes less dense.
20 A glass beaker contains water. When the centre of the base of the beaker is heated, a convection
current is set up.
glass beaker
convection
current
water
heat
Which statement explains this?
A The evaporation of water causes water molecules to rise to the surface.
B The expansion of water molecules causes them to rise to the surface.
C The water above the heat source rises because it becomes less dense.
D The water at the side falls because it becomes less dense.
Select your answer: