Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust.xtrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust. Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are formed by the cooling of molten magma on the earth's surface.
A dragonfruit is a cactus of the genus Hylocereus. The commonly known species of dragonfruit, which is red (there are several colors), is Hylocereus undatus.ragon fruit can be called Hylocereus cacti, pitaya, pitahaya, fire dragon fruit, dragon pearl fruit, green dragon, or strawberry pear.
Pitaya. Pitaya, also known as pitahaya, is the fruit of cactus species. It is commonly known as a dragon fruit, strawberry pear, or nanettikafruit. It is native to Central and South America and comes from a vine-like catus.n order to prepare a pitaya for eating, you will need to cut the fruit open in order to expose its flesh. Its flesh is sort of like a kiwi fruit because it has crunchy, black seeds. Its flesh is eaten raw, and tastes mildly sweet. It is also low in calories.