That is pumice.
The solid form of lava that is frothy when it reaches the surface is called pumice. Pumice is a light, porous volcanic rock formed when lava cools rapidly and gas bubbles are trapped within it, resulting in its characteristic frothy texture. Due to its low density, pumice can float on water and is often used in various applications, including abrasives and lightweight construction materials.
Pumice is volcanic rock formed from frothy lava. It will usually float on water because of all the gas bubbles in it.
According to my son's math homework a flat surface on a solid is called a face
The sum of all the areas of a surface of a solid is called the 'surface area'.
The crust is the solid surface of the Earth.
Magma is underground, when it reaches the surface it becomes lava. So solidified magma is really lava. The lava flow is the liquid lava as it goes down the mountain, when hard its just hardened lava. Magma is underground, when it reaches the surface it becomes lava. So solidified magma is really lava. The lava flow is the liquid lava as it goes down the mountain, when hard its just hardened lava.
Molten rock in the mantle is called magma when it is beneath the Earth's surface. When it reaches the surface through volcanic activity, it is referred to as lava. The mantle contains semi-solid rock that can flow slowly, allowing for the movement of tectonic plates.
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
curve surface area
It's called a face
A plane