The invention from the song dynasty that improved clocks was: The clock tower/clepsydra clock
This invention is the first type of clock that utilized the <em>escapement mechanism </em> that is applied by many European countries around 2 centuries later to produce their clocks.
Humans affect the water cycle in numerous ways. Some of our actions purposefully affect the water cycle and other human activities have unintentional consequences on the water cycle.We pull water out of the ground in order to use it. We change the flow of water using irrigation. We dam lakes and rivers for electricity and to create manmade lakes and ponds. The Colorado River in the US no longer reaches the ocean at times because humans have altered it so much.Climate change is causing numerous changes to the water cycle. Sea levels are rising in some areas and dropping in others, glaciers are retreating and disappearing affecting rivers, droughts are happening more frequently in some regions and floods in other areas, coastlines are changing and some islands are disappearing, the polar ice cap is melting, and so forth.
The use of pesticides, herbicides, and excess nitrogen for farming runs off into rivers and streams and pollutes groundwater. Deforestation, whether for timber or to clear land for agriculture or development, increases runoff. Certain emissions from industry cause acid rain .
Communist Manifesto Which statement challenges the main idea of Marx's statement
Explanation:
1.The Communist Manifesto summarizes Marx and Engels's theories about the nature of society and politics and is an attempt to explain the goals of Marxism, and, later, socialism
2.When writing The Communist Manifesto, Marx and Engels explained how they thought capitalism was unsustainable and how the capitalist society that existed at the time of the writing would eventually be replaced by a socialist one.
3.Dr. James Bradford "Brad" DeLong, professor of economics at UC-Berkeley, wrote in 2011 that Marx's "primary contribution" to economic science actually came in a 10-paragraph stretch of The Communist Manifesto, in which he describes how economic growth causes shifts among social classes, often leading to a struggle for political power.
This is true.
They were nomadic societies and when food and water would become scarce, many would split and go different ways based on where they believed they should go to find more.
