Answer the questions below in complete sentences. • In what layer does plasticity and convection occur?
• Which layer is thinnest under the oceans and thickest in the mountains?
• Which layer is made of solid iron?
• Which layer is the hottest? The coolest?

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.