The leaves of an electroscope are slightly separated, indicating that is charged. When you bring a positively charged rod near the sphere, the leaves spread farther apart. What charge is on the electroscope?

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

In 2002, the rare earth elements mine in mountain pass, california was closed because

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?