solve

Question 22 (1 point) Listen The is the layer of the atmosphere that has Earth's coldest temperatures and where most meteors burn up is the: troposphere mesosphere O thermosphere O stratosphere Question 23 (1 point) Listen Select the phrase that correctly describes smog. a mixture of primary and secondary pollutants O a substance that impairs the ability of blood to carry oxygen O a gas produced when coal is burned without abundant oxygen a substance that forms when sunlight reacts with vehicle exhaust Question 24 (1 point) E Listen Which of the following is a correct statement regarding the Earth's crust? It is composed of liquid It makes more than 60% of Earth's volume. It is denser than the core. It is composed of solid rock