Which type of chemical protective clothing (cpc) protects the wearer against chemical vapors or gases?

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

In which of these cases are the two wave points considered to be in phase with each other?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?