What is the nucleus of atom made of

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

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