Chalk is a soft white powdery limestone that's made with fossil shells of foraminifers. Chert is a hard dark opaque sedimentary rock which is made of silica with an amorphous fine grained texture.
Answer: central heating system
Answer:
tornados, hurricans, fires
Explanation:
Cold fronts appear in areas of large temperature and air pressure decrease, whereas warm fronts appear in areas of Temperature and air pressure increase.
<h3>What are cold fronts?</h3>
Cold fronts are masses of atmospheric air that exert pressure on light warmer air masses, which then tend to rise in the atmosphere.
Cold fronts can be diagrammed in weather maps as blue lines and different triangular forms with sense to the region where they move.
In conclusion, cold fronts appear in areas of large temperature and air pressure decrease, whereas warm fronts appear in areas of Temperature and air pressure increase.
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