Crater lake was formed when Mount Mazama produced a large eruption and collapsed to form a caldera, which then filled with water forming a lake.
Crater lake was formed approximately 7700 years ago, the caldera-forming changed the space all around the volcanic eruption. The pyroclastic flow of pumice and ash cover the area, which includes all the river, valleys that drained in Mount Mazama.
Embryonic mass cells are in constant
division, making it much easier to find good examples of each phase of mitosis. The root and the stem are the best place to
look because they contain meristematic tissue that retains the ability to
divide throughout the life of the plant.
