Choose the BEST answer from the available choices.  

1. As the cooling rate of magma increases (speeds up), the size of the crystals that form ____________.
 [A]  increases   [B]  decreases   [C] is unaffected

2. Which one of the following is an igneous rock?  [A]  limestone   [B]  rhyolite   [C] slate   [D] shale

3. Intrusive igneous rocks ____________.   [A]  are generally fine grained  [B]  form at Earth's surface  [C] are quite often vesicular         [D] are also termed volcanic   [E] none of these

4. Granite and basalt ____________.
 [A]  have a similar mineral composition   [B]  have a similar texture    [C] (A) and (B)      [D] do not have similar textures or composition

5. This is the characteristic texture of scoria:
 [A]  aphanitic   [B]  glassy  [C] porphyritic [D] phaneritic   [E] vesicular

6. Rocks that contain crystals that are roughly equal in size and can be identified with the unaided eye are said to exhibit this texture.     [A]  fine grained  [B] glassy  [C] porphyritic  [D] coarse grained  [E] pyroclastic

7. Rhyolite is the fine-grained equivalent of this igneous rock.  [A]  basalt  [B]  andesite   [C] granite   [D] diorite   [E] gabbro

8. From the following, select the fine-grained igneous rock with an intermediate composition.
 [A]  basalt   [B]  andesite   [C] granite   [D] diorite   [E] gabbro

9. The texture of an igneous rock _________.
[A]  is controlled by the composition of magma  [B]  is the shape of the rock body  [C] determines the color of the rock
[D] is caused by leaching  [E] records the rock's cooling history

10. An extrusive igneous rock containing no crystals would have a ______ texture and form by the process known as _______. [A] porphyritic; vitrification     [B] porphyblastic; metasomatism       [C] pegmatitic; refraction        [D] glassy; quenching