Why did early scientists believe that heat was a fluid

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.