4. If the scale drawing is 1cm : 10km , then 60km in map would be​

1 cm on the map represents 10 km on the ground = 10 × 15 = 150 km.So,Then the normal length of the scale should be 15 cm.(150 km is a round number.)Then,15 cm × 60 km = 9000m².Therefore,60 km in map would be 9000m².

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

the answer is:

c. islam and christianity

explanation:

islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.