By what process do electromagnetic waves release electrons from the materials they contact?
O A. The photoelectric effect
O B. Absorption of electromagnetic waves
O C. Flow of electrons from negative to positive poles
O D. Reflection of electromagnetic waves

The density of a liquid could be found by using

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

What part of the ear is names after tools, such as the hammer and the anvil?