What does a physical map show?
the names of countries, states, and cities
the history of an area
the geographical features of an area
the rest stops and restaurants in an area
Convex.
Concave curved inward (like how a cave foes in) and convex curves outward. Reflected and refracted do not apply to a lens.
Matter. I don't really know how to explain it. Sorry. But anyways, Hope this helps!
It's highly reactive and contains only one valence electron
