Indeed because some leave headlights off and ignore that fact since there are street lights around.
Yes that is a balaned equation
To solve this exercise we will use the concept related to heat loss which is mathematically given as

Where,
m = mass
= Specific Heat
Change in temperature
Replacing with our values we have that

Specific heat of mercury

Replacing

Therefore the heat lost by mercury is 0.09J
Tectonic plates is the unscrambled phrase in that jumble.