Answer:
Limestone caves are formed when acid rain occurs.
Explanation:
When chalk pieces which is made of calcium carbonate react with acetic acid, it produces carbon dioxide, calcium acetate, and water. When calcium carbonate react with Carbonated Water produces calcium bicarbonate. Limestone cave forms when the dissolution of limestone occur when rainwater which is acidic due to the addition of carbondioxide in the air react with limestone. This dissolution removes the lime from the rock and caves are formed.
Answer: D. a structure that provides a specific service within a cell
Explanation:
C. The number of protons in the atoms nucleus.
Answer:
Is soft
Explanation:
because concrete is hard ash so t hink flour would be safer
