It goes down.
The level of mercury stops at 7.6 cm because that's where the both pressure come in equillibrium, so if atmospheric pressure decreased, less air particles will force the mercury in the container, and thus the mercury will slide down into the container from the barometer.
<span>The Earth's Crust, Lithosphere and Asthenosphere. ... Also, ocean crust is made of denser minerals than continental crust. The tectonic plates are made up of Earth's crust and the upper part of the mantle layer underneath. Together the crust and upper mantle are called the lithosphere and they extend about 80 km deep.</span>
Are there supposed to be choices ?
Climate change and overexploitation of soil through human activity