Kepler's first law means that planets move around the Sun in elliptical orbits.
Answer:
Lead is one of the important elements found on earth. They are metallic gray in color and one of the heavy metal. It has a density of about 11.34 g/cm³. It has a high density because of its closed type of packing and face-centered cubic structure. Lead rarely occurs in its pure form on earth. It is mostly found to be present in association with its principle ore known as galena.
Thus, <u>lead is a very denser element as it has a very high density</u>.
<u>In a situation where there is a huge amount of lead in the earth's interior, the lead will be most likely to be found in the core of the earth</u>. It is because, in the present scenario, the core of the earth is comprised of denser elements namely iron (Fe) and nickel (Ni) that have an extremely high density.
Answer:
its b
Explanation:
hope it helps sorry if its wrong
Hi there! The answer is C. barbarian raids.
Local farmers were unable to feed the Roman population during the fall of the Roman Empire because of barbarian raids. Between the 4th and 5th century, large groups of people entered the Roman Empire, which caused state failure inside the Empire. This period is called the Migration Period and preluded the Middle Ages.
Answer:
Explanation:
Desertification:
The process of the land degradation in arid , semi - arid , and sub - humid areas because of the factors , human activities , climatic variations .
This process lead to persistent degradation of the dry land and ecosystem because of some variation in climate and man - made activities .
The major cause of Desertification are -
1. Overpopulation
2. Overgrazing
3. Deforestation
4. Unsustainable agriculture techniques
5. Climate change
6. Stripping of land resources .
7. Overgrazing of the land by the cattle and wild stock.
