The correct answer is (a) its viscosity decrease.
Viscosity is the defined as the state of being thick. The viscosity of lava is very important to determine its behavior.The fluid has the property to become thin as the temperature increases. The thin nature of liquid means decreased viscosity. Greater temperatures in lava tend to destroy polymerized bonds within the lava, which promotes more fluid behavior. Hence, the increase in temperature decreases its viscosity.
Because it is able to trap heat or rather absorb infrared. ... I think
Using the principle of faunal succession, if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time (Figure 4). If the same index fossil is found in different areas, the strata in each area were likely deposited at the same time.
Early cleavage divisions in most embryos are also rapid. One reason for this is that cleaving cells have a modified cell cycle, in which the two gap phases, G1 and G2 are completely omitted, and the cells cycle rapidly between M and S phases. In addition, because the major cytoskeletal systems of the cells are largely devoted to mitosis (microtubules) and cytokinesis (microfilaments) during rapid cleavage division, there is typically an antagonism between periods of rapid cell division and cell movement. Thus as the embryo approaches gastrulation, there is a tremendous slowing in the rate of division (note the slope of the curve at the right).
