roman medical science included iron tooth implant, hellenistic tourniquet and arterial surgical clamps true or false

Most aqueducts were constructed below the surface, with only small portions above ground supported by arches. Sometimes, where valleys deeper than 50 metres (165 ft) had to be crossed, inverted siphons were used to convey water across a valley. The Romans also made major advancements in sanitation.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.