What is physical weathering NOT caused by? (pls i really need help with this!!)

Explain which atom l or m is more stable and why

Stage in which a star’s outer layers have started to cool and grow outward?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space