The core is made almost entirely of metal. specifically, iron and nickel. The answer is A. hope this help :)
Answer:
That for years scientists have build up and found discoveries that led to recent discoveries brought by previous scientists
Explanation:
<span>When wind and running water gradually decrease in velocity, the transported sediments are deposited over a period of time, and are sorted by size and density. This is because as the velocity decreases, sediments or rocks will accumulate resulting to variety of sizes and a change in density.</span>
