==> the object's mass; ==> how close you can get to its center.
Answer: D
Explanation: The Ghana Empire, properly known as Wagadou (as Ghana was the title of its ruler), was a West African empire located in the area occupied by present-day southeastern Mauritania and western Mali. Although complex societies based on trans-Saharan trade in salt and gold had existed in the region for centuries, the introduction of the camel to the western Sahara in the 3rd century CE, opened the way to great changes in the area that eventually became the Ghana Empire.
The Ghana Empire grew rich from increased trans-Saharan trade in gold and salt, allowing for larger urban centres to develop. With these commodities being transported and traded through Ghana, the Kingdom was able to become very wealthy by taxing the goods that came through the trade center. It also helped that Ghana had many trade routes that were well protected by its large military force as this encouraged other merchants to come to Ghana for trade.
Nuclear fusion generates the energy that is released by stars.
In the great majority of stars, it's the fusion of hydrogen nuclei
to form helium nuclei plus energy. In very old stars, the nuclei
of heavier elements are fused, forming even heavier ones.
Sedimentary rock is the rock from which soil forms.
Answer:
The instruments' ability to extract iron from surroundings
Explanation:
In the book One Hundred Years of Solitude written by Gabriel Garcia Marquez, it was revealed that Jose Arcadio Buendia was fascinated by two magnetized ingots he bought from Melquíades the gypsy.
Hence, due to the ability of the magnetized ingots to draw irons, Jose Arcadio Buendia thought he could use the instrument's ability to extract gold from the underneath of the earth. He, therefore, traded his mule and pair of goats to buy the magnetized instruments.
