During summer, the Earth's orbit brings Australia closer to the sun (as compared to Europe during its summer), resulting in an additional 7% solar UV intensity. Coupled with our clearer atmospheric conditions, this means that Australians are exposed to up to 15% more UV than Europeans.
An isotope is when a normal atom has too many neutrons and its weight has been offset.
Explanation:
Self fulfilling prophecy means how our expectations or expectations of others influence our own behavior. Being self fulfilling means, to bring about a result that has been already foretold or talked about.
Whereas Stereotype is a preconceived notion about a particular type of person or thing. for examples woman as driver are not so good is an stereotype. However, the idea may untrue or partly true.

Now, question is why MgO but not CaO.
At a dissociation pressure of 1 atm, the temperature at which CO2 and metal oxide is formed is :
For MgCO3 = 540 °C
For CaCO3 = 900 °C”
Also,
<span>The driving force is the larger lattice energy of MgO(3795) vs that of CaO(3414 kJ mol^-1) . More the lattice energy, the more chances of that compound to form.</span>
So MgO is formed first.
Carbonate is Calcium carbonate