This is an example of a closed system
The size shapes and arrangements of mineral grains in an igneous rock is known as texture or rock microstructure. It refers to the components found on a rock and how a rock is composed. The texture of an igneous rock varies differently; it can be either crystalline, fragmental, or glassy.
Many scientists think the sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust known as the solar nebula. As the nebula collapsed because of its gravity, it spun faster and flattened into a disk. Most of the material was pulled toward the center to form the sun.
How old the rock is
thats my answer
The statement is true.
As weird as it may sound, helium was indeed first discovered on the Sun, and after some time on Earth. The first evidence of helium was observed on August 18 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the Sun's chromosphere. This line has been detected by a French astronomer by the name of Jules Janssen during a total solar eclipse in Gantur, India.
