Answer:
irregular
Explanation:
Irregular galaxies have no regular or symmetrical structure. They are divided into two groups, Irr I and IrrII. Irr I type galaxies have HII regions, which are regions of elemental hydrogen gas, and many Population I stars, which are young hot stars.
Sedimentary rock changes or melts into magma due to high temperature. Sedimentary rock is a type of rock that has been formed due to the deposition and solidification of sediment. It is commonly deposited in layers and often contains fossils.
The Earth rumbles and a hiss of steam issues from the top of Mt Ruapehu. Are these two events related? Is the earthquake caused by the volcano? Or is the steam caused by the earthquake?
Tectonic plates
When Alfred Wegener first proposed the idea of continental drift (the precursor idea to plate tectonic theory), it didn’t quite explain the full story. While he correctly showed that Africa and South America fitted together, his model wasn’t able to explain the violent forces that occur around the Earth’scrust.
The railroad tracks are parallel, because they go the same direction and don't intersect
