While the author of the essay advocates for the use of volcanic rock as construction material, the speaker opposes his view and refutes his points.
First of all, the essay speaks about the durability of volcanic rock by stating that volcanic rock is resistant to weathering, erosion, and heat. The speaker refutes this point and explains that while volcanic rock is resistant to those conditions, it does not handle stress well. So, if buildings made from volcanic rocks were to experience tremors or earthquakes, they would likely collapse and fall apart
Secondly, the author wrote about igneous rock’s insulating properties, stating that volcanic rocks have naturally porous structure. The speaker challenges this fact and says that the rock’s insulating properties are overstated and that modern insulators have better heat stabilizing properties.
Finally, the writer stated that volcanic rocks are more environmentally friendly and better than conventional construction methods.However , the speaker says that their extraction is less friendly to the environment than the writer makes it out to be. He explains that habitats could be affected by the extraction and entire ecosystems could be destroyed. Additionally, the extraction methods likely use fossil fuels and might ruin the environment more than the production of construction materials.