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.
Five Key Differences. 1  In meiosis, homologous chromosomes pair with each other (i.e., they form tetrads) and crossing-over occurs. In mitosis, neither of these things occur. 2  In metaphase I of meiosis, tetrads align on the metaphase plate. In metaphase of mitosis, individual chromosomes align there.