Physics
An electron microscope gives higher magnification than an optical microscope, because :

The wavelength of electrons is smaller as compared to the wavelength of visible light
It uses more powerful lenses
The electrons have more energy than the light particles
The velocity of electron is smaller than that of visible light

ANSWER DOWNLOAD EXAMIANS APP

Physics
Thermohaline circulation is mainly due to

Warm water being added to the ocean due to industial waste
Winds causing circulation of ocean water
Warmer, less dense water sinking in the ocean and cold water replacing it
Cold, dense ocean water sinking and warmer water replacing it

ANSWER DOWNLOAD EXAMIANS APP