Answer:
Igneous- relating to, resulting from, or suggestive of the intrusion or extrusion of magma or volcanic activity
metamorphic- describes a specific process that some rocks undergo when heat and pressure changes them.
extrusive- rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff.
The correct answer to your question would be <span>Mohorovicic Discontinuity, the reasoning behind this is because seismic waves can change the speed.
Other reasons you should learn about </span><span>Mohorovicic Discontinuity is because, its the boundary between the crust and mantle.</span>
Because of the nitrogen cycle all of the above answers are correct
In the stomach, food undergoes chemical and mechanical digestion. Peristaltic contractions (mechanical digestion) churn the bolus, which mixes with strong digestive juices that the stomach lining cells secrete (chemical digestion). As food travels from your mouth into your digestive system, it's broken down by digestive enzymes that turn it into smaller nutrients that your body can easily absorb. This breakdown is known as chemical digestion.