Any fossil fuel like tar, gas, etc
Without water humans cannot survive and humans need to use only the necessary for conserve water
Subsequince farming- not for profit- grew only enough for themselves- comercialfarming- for profit- sold goods to public- similarities- both grew ate some of what they grew.
Viscosity is the ability of a substance (in this case, lava) to resist flow. First of all, the temperature of the lava affects the viscosity. Lava with a higher temperature has lower viscosity than cooler lava (higher viscosity) since cooler lava is starting to solidify thereby increases its resistance to flow. The composition of the lava is also a determinant of viscosity such as the silicon content of the lava. The higher the silicon content of the lava, the higher the internal friction of the lava, thereby higher resistance to flow.
