1) earth's crust is made up of relatively rigid plates that ride atop earth's hot, semiliquid mantle. (2) the plates are called tectonic because they're in constant motion. (3) they can move because earth's mantle is a very hot and semiliquid fluid called magma. (4) volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) therefore, we often find volcanoes and earthquakes along plate boundaries. (7) plates may also collide. (8) when that happens, mountain ranges are formed. (9) for example, the collision of the plate carrying the indian subcontinent created the himalayan mountains when it collided with the asian plate. which statement about this paragraph is accurate? a. the topic sentence is the found in the last line. b. there are no supporting details for the main idea. c. the author uses comparison and contrast to organize ideas. d. there is no single topic sentence.

Read the excerpt from act 1 of a doll's house. helmer: nora! [goes up to her and takes her playfully by the ear.] the same little featherhead! suppose, now, that i borrowed fifty pounds today, and you spent it all in the christmas week, and then on new year's eve a slate fell on my head and killed me, and— nora: [putting her hands over his mouth]. oh! don't say such horrid things. helmer: still, suppose that happened, —what then? nora: if that were to happen, i don't suppose i should care whether i owed money or not. helmer: yes, but what about the people who had lent it? nora: they? who would bother about them? i should not know who they were. helmer: that is like a woman! but seriously, nora, you know what i think about that. no debt, no borrowing. there can be no freedom or beauty about a home life that depends on borrowing and debt. we two have kept bravely on the straight road so far, and we will go on the same way for the short time longer that there need be any struggle. nora: [moving towards the stove]. as you , torvald. how does the interaction between helmer and nora advance the plot? nora realizes that helmer will completely disapprove of her having borrowed money, so she has to continue to keep it a secret from him. nora realizes that she and helmer have the same ideas about financial issues, and the conversation brings them closer together later in the play. helmer realizes that nora is more responsible with money than he originally thought, and he trusts her more with finances later in the play. nora realizes that helmer knows a lot more about borrowing and lending, and she will seek his input later when she needs it.