Question

Pillow basalts attain their distinctive blob-like shapes because their parent lavas do not travel far prior to solidification. This is because the parent lavas ________. A. are completely devoid of volatiles and thus travel slowly B. erupt underwater and thus cool very quickly C. are highly felsic and thus travel slowly D. are ultramafic and thus freeze at exceptionally high temperatures

Answer 1

Option (B)

Step-by-step explanation:

Pillow basalts are the contrasting featured rocks that are similar to the pillows in terms of appearance. They are long and accumulated over one another. These are igneous rocks that are formed when an underwater volcano erupts and the magma cools so rapidly that it solidifies and forms rocks giving the shape of pillows. This helps in depicting that the places where these rocks are found were once submerged under water.

The parent lava erupts and cools at an extremely faster rate.

Thus, the correct answer is option (B).

Answer 2

B. erupt underwater and thus cool very quickly

Step-by-step explanation:

• The pillow basalts attain their distinctive shapes and are a blob type due to the their shapes of the parent lava formations that don't travel and not far before they solidify thus they are formed due to the underwater and erupt very quickly and thereby attain a distinctive shape. Being igneous in nature they have rapid cooling and look like pillows.