The basaltic lava flows weather according to their age (darker is younger). Place the three lava flows in chronologic order from youngest to oldest.

pillow, pahoehoe , and a'a .

Explanation:

While the pahoehoe lava ais characterized by the smooth and the gently sloping surface and have more of the fluid flow and are black and have a comply has a silver iridescent and is characterized by the upwelling of the hot viscous.  The aa lava flow comes from the volcanoes that have very thick viscous lalcv that travels very slowly and this lava bio eng thick and dense and have a dense core and has a shape spin surface of a cooling rocks and they beigslver grey to darker grey and is due to the aa lava is rubby and pahoehoe is glassy. The pillow is lava flows that contain the characteristic of the pillow-shaped structure and attribute to the extension of the lava and this type of the volcanic rocks is characterized by the thick sequence of the discontinued pillows shaped masses.

A,b,c is the answer to the question