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.
Some parts of space are hot! Gas between stars, as well as the solar wind, both seem to be what we call empty space, yet they can be more than a thousand degrees, even millions of degrees. However, there's also whatâs known as the cosmic background temperature, which is minus 455 degrees Fahrenheit. So what would a thermometer in space reveal? Somewhere between those extremes â depending on whether it's in the sun or the shade. Here's whatâs going on: Most of the gas in space is too thin to warm anything up.