A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish. 
-Which drawing best shows the approximate level of the mercury in the tube when the temperature of the entire apparatus is lowered from +20°C to -20°C?
Definitions:
Emancipation Proclamation
An executive order issued by President Abraham Lincoln in 1863, declaring the freedom of all enslaved people in Confederate states that were in rebellion against the Union.
1863
A significant year in U.S. history marked by the Emancipation Proclamation, which declared the freedom of slaves in Confederate territories.
No Man's Land
A term used to describe the unoccupied land or territory between opposing trenches on a battlefield, especially during World War I, often dangerous and heavily mined.
Front Lines
The most forward position of an army or fleet during a conflict where direct fighting occurs.
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