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Câu hỏi:

20/07/2024 1,652

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

Any rock that has cooled and solidified from a molten state is an igneous rock. Therefore, if the Earth began as a superheated sphere in space, all the rocks making up its crust may well have been igneous and thus the ancestors of all other rocks. Even today, approximately 95 percent of the entire crust is igneous. Periodically, molten material wells out of the Earth's interior to invade the surface layers or to flow onto the surface itself. This material cools into a wide variety of igneous rocks. In the molten state, it is called magma as it pushes into the crust and lava when it runs out onto the surface.

All magma consists basically of a variety of silicate minerals (high in silicon-oxygen compounds), but the chemical composition of any given flow may differ radically from that of any other. The resulting igneous rocks will reflect these differences. Igneous rocks also vary in texture as well as chemistry. Granite, for instance, is a coarse-grained igneous rock whose individual mineral crystals have formed to a size easily seen by the naked eye. A slow rate of cooling has allowed the crystals to reach this size. Normally, slow cooling occurs when the crust is invaded by magma that remains buried well below the surface. Granite may be found on the surface of the contemporary landscape, but from its coarse texture we know that it must have formed through slow cooling at a great depth and later been laid bare by erosion. Igneous rocks with this coarse-grained texture that formed at depth are called plutonic.

On the other hand, if the same magma flows onto the surface and is quickly cooled by the atmosphere, the resulting rock will be fine-grained and appear quite different from granite, although the chemical composition will be identical. This kind of rock is called rhyolite. The most finely grained igneous rock is volcanic glass or obsidian, which has no crystals. Some researchers believe this is because of rapid cooling; others believe it is because of a lack of water vapor and other gases in the lava. The black obsidian cliffs of Yellowstone National Park are the result of a lava flow of basalt running head on into a glacier. Some of the glacier melted on contact, but suddenly there also appeared a huge black mass of glassy stone.

Granite that has been found above ground has been_____________.

A. pushed up from below the crust by magma

B. produced during a volcanic explosion

C. gradually exposed due to erosion

Đáp án chính xác

D. pushed up by the natural shifting of the Earth

 Xem lời giải

Trả lời:

verified Giải bởi Vietjack

Đáp án C

Đá hoa cương được tìm thấy trên mặt đất đã _____________.

A. được mắc ma đẩy lên từ bên dưới lớp vỏ

B. được tạo ra trong vụ nổ núi lửa

C. dần dần lộ ra do xói mòn

D. được đẩy lên do sự dịch chuyển tự nhiên của Trái Đất.

Thông tin trong bài: "Normally, slow cooling occurs when the crust is invaded by magma that remains buried well below the surface. Granite may be found on the surface of the contemporary landscape, but from its coarse texture we know that it must have formed through slow cooling at a great depth and later been laid bare by erosion." (Thông thường, quá trình làm nguội chậm xảy ra khi lớp vỏ bị xâm lấn bởi mắc ma vẫn bị chôn vùi dưới bề mặt. Đá hoa cương có thể được tìm thấy trên bề mặt của quang cảnh hiện thời, nhưng từ kết cấu thô của nó, chúng ta biết rằng nó chắc là được hình thành qua quá trình làm nguội chậm ở độ sâu lớn và sau đó lộ ra do xói mòn).

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