Geo Dynamo and Solar Winds

Q. The correct order of melting point is: (a) BeO > CaO > MgO (b) MgO > CaO > BeO (c) CaO > MgO > BeO (d) BeO > MgO > CaO

Q. The temperature of the earth's outer core is around degrees Celsius.

1. 4000 - 5000
2. 2000 - 3000
3. 1000 - 2000