Art history: mortar was a combination of sand, lime and water used as a bonding agent in ashlar masonry (a type of construction that mostly uses rectangular blocks of stone). it was a very common in the acient world. what was the major contribuution the romans mande to the montar recipe, how did it improve builing?its due !

it was petrified wood that was used and mixed with the sand and water which turned it into a hard stone type substance

Explanation: was used in the stone age

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.