Crust is the Earth's outermost layer.Thecrust is made up of tectonic plates, which are in constant motion.
Answer:
The presence in the air of one or more contaminants in such a concentration and of such duration as to cause a nuisance or to be injurious to human life, animal life or vegetation.
They should study about how volcanoes erupt or explodes
White with black stripes.
I think the answer is visual learning
