The threat they pose is largely dependent on how the flow moves, which is in turn determined by the properties of the lava and the landscape. The two main types of lava, pahoehoe and `a`a, differ in various properties, such as crystal and gas bubble content, as well as having slight differences in temperature.These properties, along with the steepness of the underlying slope, determine the ease with which a lava flow moves.ahoehoe and `a`a lava flows. Lava flows are one of the most common hazards produced by active volcanoes. Here in Hawai`i, they may endanger property but seldom endanger people's lives.
This type of cell division results in the production of gametes (eggs or sperm). Meiosis is much more complex than mitosis. Whereas mitosis involves the duplication and subsequent division of chromosomes, meiosis involves two divisions of genetic material. As is the case in mitosis, in meiosis the cell duplicates its chromosome number prior to beginning cellular division. Then nuclear division, the sorting out of the genetic material, begins, and unfolds over the course of 2 cellular divisions that result in 4 gametes.
What occurs in meiosis but not mitosis? Mitosis and meiosis are specialized types of cell division, but take place in different locations. Mitosis occurs only in body cells, or somatic cells, while meiosis takes place in the cells of the testes and ovaries, which are the primary reproductive organs. Mitosis is triggered by the coupling of haploid sperm with a haploid egg; this coupling leads to fertilization.