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1.Identify this rock. Gabbro Quartz Biotite Granite Rhyolite
2. What would be a place to expect to find this rock. Hawaii Cascade Mountains in Washington Great Barrier Reef Texas Hill Country East Texas Pineywoods
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3. What rock is this? Orthoclase Biotite Granite Rhyolite Rose Quartz
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4. Which rock was exposed by erosion long after it had cooled deep in Earth’s crust?
Olivine Pumice Basalt Rhyolite Granite
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5. What kind of rock might form from this lava once it cools?
Magma Granite Rhyolite Basalt Pyroxene
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6. Use the Bowen’s Reaction Series to predict what kind of rock would form from a magma that crystallizes at a high temperature deep in Earth’s crust. Granite Peridotite Pumice Obsidian Rhyolite
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7. Identify this rock.(Hints: it’s silica-rich and floats on water.)
Pumice Basalt Scoria Granite Peridotite
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8. Which kind of magma would most likely form obsidian?
A silica-rich magma that’s cooled instantly. A silica-rich magma that’s cooled slowly. A silica-poor magma that’s cooled instantly. A silica-poor magma that’s cooled slowly. None of the above
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9. This is Enchanted Rock, northwest of Fredericksburg
9. This is Enchanted Rock, northwest of Fredericksburg. What kind of igneous rock would you most likely find here? Arenite Basalt Rhyolite Granite Peridotite
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10. What process could have formed this rock?
Volcanic eruption Evaporation Plankton being buried & compacted Mountain-building as two continents collided.
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11. What would NOT be considered a type of coal?
Anthracite Bituminous Lignite Peat Carbide
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12.Identify Andesite Basalt Pumice Diorite Granite
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13. Which formation would most likely contain columnar basalt?
Composite volcano Cinder cone Laccolith Volcanic Neck
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14. This metamorphic rock – made up entirely of quartz - was once…
Shale Slate Sandstone Schist
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15. Which texture best describes this rock?
Fine-grained Coarse-grained Volcanic Glass Porous
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16. Use the Bowen’s Reaction Series to predict what kind of rock would form from a magma that crystallizes at a low temperature at Earth’s surface. Granite Peridotite Pumice Obsidian Rhyolite
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17. Identify Gabbro Granite Obsidian Andesite Rhyolite
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20. Use the Bowen’s Reaction Series to find which mineral is the first to come out of solution in a magma? Quartz Olivine Na-Plagioclase Orthoclase Muscovite
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21.Which rock would most likely be ejected from this eruption?
Pumice Basalt Granite Diorite Gabbro
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22. What element is present in scoria that makes it darker and heavier than pumice?
Al Na Ca K Fe
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1 meter 10 meters 15 meters 24 meters 30 meters
23. This is a sketch of a geological cross-section nearby, in Washington County. At what elevation would one be sitting on a pile of volcanic ash? 1 meter 10 meters 15 meters 24 meters 30 meters
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24. Which situation would produce rocks with a fine-grained texture?
B.
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25.What sedimentary rock would most likely form from this environment?
Sandstone Breccia Coal Dolomite
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1 meter 10 meters 15 meters 24 meters 30 meters
26. This is a sketch of a geological cross-section nearby, in Washington County. At what elevation would one be sitting on an ancient sand dune? 1 meter 10 meters 15 meters 24 meters 30 meters
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27. Where on this geologic map might metamorphic rocks be expected to be found?
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28. This rock was found in Central Texas
28. This rock was found in Central Texas. It indicates the existence of _____________ in Texas’ geological past. Plutons Lava Flows Violent eruptions Hydrothermal vents
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It was covered in glaciers. It was at the bottom of the sea.
29. This is Pilot Knob, an extinct volcano located just southeast of Austin. The volcano is composed of basalt. What does this indicate about this part of Central Texas at the time this volcano was active? It was a desert area. It was covered in glaciers. It was at the bottom of the sea. It was rainforest
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30. This is Sideling Hill in Maryland
30. This is Sideling Hill in Maryland. Which of Steno’s Laws is BEST demonstrated here? Law of Superposition Law of Original Horizontality Law of Cross-cutting Relationships Principle of Unconformities
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31. What geologic process is being depicted here?
Metamorphism Volcanism Erosion Deposition 32. The series of yellow, brown, green, & blue bands represent different types of … Granite Gneiss Slates & Schists Basalts
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33. These are photos of fresh lava recently erupted along the East Pacific Rise. What rock might it be? Rhyolite Gabbro Peridotite Basalt
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34. What accounts for the differences between Obsidian and Pumice?
Obsidian Butte Obsidian Butte is a single dome of rhyolite. At the coordinates, the dome is made up of gray to black rhyolite pumice and obsidian. Pumice is a light air-filled volcanic glass. It can be described as a rock sponge because of the rock is filled with frozen gas bubbles. Pumice forms during explosive eruptions when volcanic gasses that were dissolved in the magma suddenly come out of solution and the magma cools quickly to trap the shape of the bubbles. The effect is similar to the results of a shaken carbonated drink after you open it and the foam instantly freezing. Other types of magma will also form pumice. Elsewhere on the dome you will find rhyolitic breccia. Some areas of the dome have obsidian. Obsidian is a dense volcanic glass. Obsidian forms under similar situations as pumice, but there is not as much gas dissolved in the magma, so the glass form a dense mass. Obsidian usually forms from rhyolitic lava. The black color comes predominantly from tiny minerals of magnetite trapped with in the glass. Obsidian fractures easily and forms very sharp edges, so be careful. 34. What accounts for the differences between Obsidian and Pumice? Mineral Content Metal Content Cooling time Pressure Gas Content
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