They don't actually "sink" , the only way for continets to "sink" is if the worlds ice caps melt little by little, some continets get flooded
The above answerer can't hide his ignorance. Continents can, in deed, sink. Consider the case of the continent of Zealandia. Also known as Tasmantis or the New Zealand continent. It broke away from Antarctica 80 to 130 million years ago. Then it was finally submerged when it broke away from Australia 60 to 85 million years ago. It is considered to be completely submerged as of 23 million years ago. 93% of remains beneath the Pacific Ocean.
convection currents due to the heat derived from radioactive decay (which is happening deep in the earth) moves the plates hence moving the continents in different directions
Continents, Islands
The land masses that the Earth is divided into are called continents. There are seven continents on Earth: Africa, Antarctica, Asia, Europe, North America, Australia, and South America.
Silicon will sink in water because it has a higher density than water.
Continents
The asthenosphere is just below the lithosphere and is where plate tectonic movement and isostatic adjustments occur. The continents float on this malleable layer that is semi-solid.
isostasy. This process involves the equilibrium between the lithosphere and the asthenosphere, with the less dense continental crust "floating" on the denser underlying mantle. This balance allows continents to rise or sink to maintain overall stability.
convection currents due to the heat derived from radioactive decay (which is happening deep in the earth) moves the plates hence moving the continents in different directions
The future tense of "sink" is "will sink".
continents
But mountain ranges on continents do sink into the soft asthenosphere! They sink more than their continent but they still float on the heavier material beneath. A large tall cruse ship (mountain) will sit much deeper in the water than a flat barge (a continent). Still, the large cruse ship will float in the more dense material underneath. Just as the water has a greater density than the large cruise ship, the asthenosphere still has a greater density than the mountain range.
Continents, Islands
As in 'sink a boat' or 'the kitchen sink'?
A Belfast sink is a deep, rectangular, ceramic sink, also known as an elephant sink.
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A hammer will sink
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