Author's Purpose Practice Test

Read: A volcano is like a pressure cooker under Earth’s crust. Magma gathers in a chamber deep below. Gas bubbles expand and raise the pressure. When the pressure is too high, rock cracks and magma escapes as lava. Which of the following best describes the author's intent in this text?

Read: A butterfly begins as an egg on a leaf. It becomes a caterpillar that eats leaves for energy. Next it forms a chrysalis, where its body changes. After about two weeks, an adult butterfly comes out and dries its wings. What is the author's main purpose in this passage?