A physical change chamges the substances apperance, but a chemical changes the chemical formula of a substance. Hope this helps!
A DYNASTY is a series of rulers from the same family.
A Political Dynasty is where a family or group maintains power by controlling the state for several generations.
Examples of a Dynasty are:
*Bourbon Dynasty - a European royal line that ruled in France from 1589 to 1793 and also ruled Spain, Naples, and Sicily.
*Ming Dynasty - the imperial dynasty of China that ruled from 1368 to 1644
In Theocracy, government leaders are members of the clergy and its legal system is based on religious law.
An Empire is a political structure where one state dominates other states. It Empire head is called Emperor or Empress.
Monarchy is a form of government where one or more individual reigns sovereignty until death or abdication. It head of state can be a King or Queen.
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The Aswan High Dam was built to regulate and control the annual flooding of the Nile River in order to protect crops and property from such uncontrolled flooding and to generate electricity. Most of its effects have been positive but several environmental effects are:
- Water-logging: because of the continuous high levels of water, the soil around the area is saturated with water, which prevents oxygenation of the soil that is essential to several plants and crops.
- Salinization of soils: caused by the inability of water-saturated soils to absorb salt, it is toxic to crops and damaging to infrastructures.
- Soil Erosion: it is a consequence of soil salinization as crops die and are unable to hold the soil in place.
There were also other negative effects such as:
- Archeology: two important archeological sites of Ancient Egypt were flooded and covered by the dam waters: the ancient cemetery of Fadrus and the Buhen fort.
- Loss of sediment: the annual flooding carried an enormous amount of sediment that is now trapped within the resulting Lake Nasser. Many of these sediments were used by local industries to manufacture bricks and they lost access to this renewable source of raw materials.
- More expensive and difficult purification of water: because the water does not move as much it is more transparent and allows the sunlight to penetrate deeper. This, combined with the trapped sediments has increased the growth of algae that have proliferated to the point that water purification is more and more expensive due to the necessary removal of this plant.
Answer:By one estimate, 100,000 slaves escaped from bondage in the South between 1810 and 1850. Aiding them in their flight was a system of safe houses and abolitionists determined to free as many slaves as possible, even though such actions violated state laws and the United States Constitution
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