Question

if you know to a rock in water ,it will most portable skin. however, if you throw a pumice rock in water, it will float? why does this happen ​

Answer 1

Because pumice rock is very light floatered volcanic rock

Answer 2

Answer:

Hey mate, this is your answer

Explanation:

When an underwater volcano spurts molten rock, the lava rushing out into the water column quickly cools, fills with gas, hardens and rises to the surface.

This bubble-filled rock is called pumice, which often washes together to form a raft at the mercy of the wind and waves.

And while you might use your pumice to scrape away dead skin, as an ocean raft, it's a safe haven for new life to attach to and grow.

A rocky raft of life:

While the geological processes of bubbling lava are undoubtably intriguing, it's the biological processes that rapidly take over the buoyant pumice that fascinate scientist Eleanor Velasquez.

"When they wash up, they are literally chock-a-block full of animals and plants," said Dr Velasquez, who studies pumice rafts at Griffith University.

"The beauty of the pumice raft is that it gets washed around past all these different shallow marine reef systems and has the opportunity to pick up all of these hitchhiking corals and oysters and barnacles," she said.

Many species of marine animals and plants reproduce by dispersing eggs and sperm or larvae into the open water.

But they can't exist in that form forever and sedentary animals like corals and oysters need to find a hard surface to settle down on.

The thousands of tiny holes in the pumice that formed when the hot lava cooled not only enable the rock to float, but also make the perfect home for microscopic animals and plants.

"We call those safe sites," Dr Velasquez said.

"With the pumice, suddenly you've got trillions of mini habitats that allow planktonic species to colonise something that wasn't previously there."

But Dr Velasquez has found that there's one particular animal that's needed to really kickstart the colonisation and allow the pumice raft to become a floating marine hotel.

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