-The main city is located in an isolated state
-It is assumed there are no significant transport infrastructures such as major roads or rivers and that farmers are transporting their production to the market using horses and carts
-The land surrounding the market is entirely flat and its fertility uniform.
Answer:
b. Extrusive igneous rocks.
Explanation:
Extrusive rocks are rocks from magma that were thrown at Earth's surface while intrusive rocks are the ones from magma which were forced into rocks in the Earth’s crust.
When the lava and volcanic ash get to the surface, the rocks that are formed are extrusive igneous rocks.
War
Explanation:
Europe has evolved and changed due to war, borders have been moved, countries have been conqered and war has made what Europe looks like today with all of its present borders.
Explanation:
Ecology is the science of the study of ecosystems. Ecological balance has been defined by various online dictionaries as "a state of dynamic equilibrium within a community of organisms in which genetic, species and ecosystem diversity remain relatively stable, subject to gradual changes through natural succession." and "A stable balance in the numbers of each species in an ecosystem."