Answer:
Stars which never disappear below the horizon are called <u>circumpolar</u> stars.
Answer:
Salt is effective as a preservative because it reduces the water activity of foods. Adding salt to foods can also cause microbial cells to undergo osmotic shock.
<span>Actually Igneous rocks are classified either based on grain size or
based on mineralogy. However grain size is clearly not a chemical property. So
we can say that they are classified chemically based on mineralogy or the
abundance of quartz or silica present.</span>
