The Eastern European countries needed to change their political and economic system when they broke away from the Soviet Union.
Explanation:
Eastern Europe, or rather the countries of this region, were all satellites of the Soviet Union. While some countries did this willingly, some were forced to do so. All of these countries were under control of the Soviet Union and its interests, and the politicians that ruled them were very close to the Soviets, or installed by the Soviets.
This all came to an end when the Soviet Union started to lose its power and eventually broke up, while in meantime the people of these countries were constantly protesting and pushing from greater autonomy and eventual freedom. Once free from the grip of the Soviets, the Eastern European countries immediately started to change, and that was done through the political systems, from communism moving to democracy, and the economic system, from command economy moving to market economy.
Some of the countries that were in this situation were:
- Hungary
- Poland
- Czechoslovakia (now Czechia and Slovakia)
- Romania
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Answer:
Sedimentary rocks are the rocks that are formed as a result of compaction and lithification of sediments. These are directly obtained from the sediments of the pre-existing rock. These sediments after weathering of the rocks are transported from one place to another with the help of agents such as wind, water, and ice. These sediments are then deposited at a different place. Then, it finally turns into sedimentary rocks. For example, Shale, Sandstone and Limestone.
The common minerals that are found to be present in the sedimentary rocks are feldspar, clay minerals, and mica. The sediments such as quartz and clay minerals are derived by chemical weathering of rocks that act as a cementing material holding the sediments together. These sedimentary rock-forming minerals are abundant on the earth's surface and are comparatively much stable. So, with time, they undergo compaction and solidification and forms sedimentary rocks.