Question

question 17 2 pts the principle of isostasy suggests which of the following about high - elevation mountain ranges? mountain ranges exist only where the lithosphere is thinned due to compression. mountain ranges are flanked by a series of complex normal faults. mountain ranges are supported by a thick root of continental lithosphere. mountain ranges are underlain by a layer of dense oceanic lithosphere question 18 2 pts which of the following rocks would you expect to form in a large desert, such as the sahara desert? limestone containing marine animal fossils. interbedded siltstones and mudstones with abundant plant fossils. a conglomerate containing abundant rounded gravel - sized quartz clasts. a well - sorted cross - bedded sandstone.

Explanation:

For Question 17, the principle of isostasy states that the elevation of land masses is related to the thickness of the underlying lithosphere. Mountain ranges are high - elevation features supported by a thick root of continental lithosphere. For Question 18, deserts are arid environments where wind - blown sand is common, leading to the formation of well - sorted cross - bedded sandstone.

Answer:

Question 17: Mountain ranges are supported by a thick root of continental lithosphere.
Question 18: A well - sorted cross - bedded sandstone.