question 17\nwhat is the relationship between texture and cooling rate?\nsmaller grains = slower…

question 17\nwhat is the relationship between texture and cooling rate?\nsmaller grains = slower cooling\nlarger grains = faster cooling\nlarger grains = slower cooling\n\nquestion 18\nwhat controls viscosity of lava?\ntemperature of lava\nrate of cooling\nminerals present in lava\nall of the above

question 17\nwhat is the relationship between texture and cooling rate?\nsmaller grains = slower cooling\nlarger grains = faster cooling\nlarger grains = slower cooling\n\nquestion 18\nwhat controls viscosity of lava?\ntemperature of lava\nrate of cooling\nminerals present in lava\nall of the above

Answer

Brief Explanations:

For Question 17: When magma cools slowly, there is more time for mineral crystals to grow, resulting in larger grains. When it cools quickly, crystals have less time to grow, leading to smaller grains. For Question 18: Temperature affects the kinetic energy of lava - higher temperature means lower viscosity. Cooling rate can change the state and thus viscosity over time. Minerals present can affect the internal structure and flow - ability of lava, influencing viscosity.

Answer:

Question 17: Larger grains = slower cooling Question 18: all of the above