Achange where compounds are formed or decomposed is a(n) physical change phase change nuclear change chemical change

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

What is the percentage composition of carbon in the compound ch4

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