Which mineral will scratch glass?

If a substance is not at its melting or boiling point, as the heat content of a sample of matter increases, its temperature increases the number of intermolecular bonds decreases the space between particles increases the particles move faster

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom