List the points in particle theory

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

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

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