Why does oceanic crust sink beneath continental crust at convergent boundaries?

Oceanic crust is denser than continental crust.

Explanation:

The density difference arises because of partial melting.

When you partially melt a rock, the lighter minerals melt before the denser ones, so the rocks that form from the melt are less dense than before.

After each cycle of partial melting, the rocks become progressively less dense.

The continental crust is formed more cycles of partial melting than oceanic crusts. As a result, the density of continental crust (2.7 g/cm³) is less than that of oceanic crust (3.3 g/cm³).

Consequently, the denser oceanic crust is subducted below the continental crust at a convergent boundary.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.