Volcanic rocks are usually fine-grained or aphanitic to glass in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable with the unaided eye.Rhomb porphyry is an example with large rhomb shaped phenocrysts embedded in a very fine grained matrix.Volcanic rocks often have a vesicular texture caused by voids left by volatiles trapped in the molten lava.henocrysts are crystals that are larger than the matrix and are identifiable with the unaided eye. Rhomb porphyry is an example with large rhomb shaped phenocrysts embedded in a very fine grained matrix. Volcanic rocks often have a vesicular texture caused by voids left by volatiles trapped in the molten lava.
The actual temperature in space is about 3Â°K (-270Â°C or three degrees Celsius above Absolute Zero). There are still molecules in space, just very few of them, and this is their temperature. Absolute zero is a theoretical temperature where the thermal kinetic energy of the molecules in a body goes to zero.
The effective temperature of Uranus is -216Â°C or -357Â°F. At 1 bar of pressure in the planet the temperature is -197Â°C or -322.6Â°F and at .1 bar of pressure in the planet the temperature is -220Â°C or -364Â°F. Although Uranus is not the furthest planet from the Sun it is definitely the coldest planet in our solar system.It also has the least warm core at 4,727Â°C or 8,540.6Â°F than any of the other gas planets (Jupiter, Saturn, Neptune).lthough Uranus is not the furthest planet from the Sun it is definitely the coldest planet in our solar system. It also has the least warm core at 4,727Â°C or 8,540.6Â°F than any of the other gas planets (Jupiter, Saturn, Neptune).