Answer the following question given this paragraph: A voltaic cell uses a spontaneous redox reaction to generate an electric current. It is also possible to do the opposite. When an external source of direct current is applied to an electrochemical cell, a reaction that is normally nonspontaneous can be made to proceed. Electrolysis is the process in which electrical energy is used to cause a nonspontaneous chemical reaction to occur. Electrolysis is responsible for the appearance of many everyday objects such as gold-plated or silver-plated jewelry and chrome-plated car bumpers. Q: A voltaic cell uses what type of reaction to generate an electric current Choices: - spontaneous catalyst - chemical reaction - instantaneous redox - spontaneous redox A:
spontaneous redox

Answer the following question given this paragraph: The Sun is made almost entirely of the elements hydrogen and helium. The Sun has no solid material. Most atoms in the Sun exist as plasma . Plasma is superheated gas with an electrical charge. Because the Sun is made of gases, it does not have a defined outer boundary. Like Earth, the Sun has an internal structure. The inner three layers make up what we would actually call "the Sun. ". Q: What two elements primarily make up the sun? Choices: - oxygen and hydrogen - nitrogen and argon - calcium and helium - hydrogen and helium A:
hydrogen and helium

Answer the following question given this paragraph: Pahoehoe lava is thinner than a'a, and flows more readily. Its surface looks more wrinkly and smooth. Pahoehoe lava flows in a series of lobes that form strange twisted shapes and natural rock sculptures ( Figure below ). Pahoehoe lava can form lava tubes. The outer layer of the lava flow cools and solidifies. The inner part of the flow remains fluid. The fluid lava flows through and leaves behind a tube ( Figure below ). Q: What type of thin lava forms shapes and tubes as it flows? Choices: - spicule - xeric - xerophyte - pahoehoe A:
pahoehoe

Answer the following question given this paragraph: Paved roads and parking lots prevent rainwater from soaking into the ground. This increases runoff and the potential for soil erosion. Q: What type of roads and parking lots prevent rainwater from soaking into the ground? Choices: - gravel - shaded - dirt - paved A:
paved