Types Of Rocks Trivia Questions And Answers

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Metamorphic rock forms as a result of:

Answer: Heat and pressure.
Metamorphic rock forms as a result of heat and pressure. When rocks are subjected to intense heat and pressure, the minerals within them undergo chemical and physical changes, causing the rock to transform into a new type of rock with different characteristics. This process, known as metamorphism, occurs deep within the Earth's crust where temperatures and pressures are high. The other options, cooling of magma, compaction of sediments, and melting of rock, are processes that lead to the formation of other types of rocks such as igneous and sedimentary rocks, but not metamorphic rocks.

A rock that forms when magma hardens beneath Earth's surface is called an:

Answer: Intrusive igneous rock.
An intrusive igneous rock is formed when magma cools and solidifies beneath the Earth's surface. This process allows for slow cooling, which results in the formation of large crystals within the rock. In contrast, extrusive igneous rocks are formed when magma erupts onto the Earth's surface and cools quickly, resulting in the formation of small crystals or glassy textures. Metamorphic rocks, on the other hand, are formed through the transformation of existing rocks due to high heat and pressure, and sedimentary rocks are formed through the accumulation and lithification of sediments. Therefore, the correct answer is intrusive igneous rock.

Lava that cools so quickly that crystals do not have time to form will lead to igneous rocks with a: 

Answer: Glassy texture.
When lava cools rapidly, the molecules do not have enough time to arrange themselves into a crystalline structure, resulting in a glassy texture. This occurs when the lava is quickly quenched, such as when it comes into contact with water or air. In contrast, a porphyritic texture is characterized by large crystals surrounded by a fine-grained matrix, indicating a two-stage cooling process. A coarse-grained texture is formed when the lava cools slowly, allowing larger crystals to form. A fine-grained texture is typically the result of rapid cooling, but not as rapid as the glassy texture.

Fossils are found only in:

Answer: Sedimentary rocks.
Fossils are found only in sedimentary rocks because these rocks are formed by the accumulation of sediments, which can include the remains of plants and animals. Over time, these sediments are compacted and cemented together, preserving the fossils within the rock layers. In contrast, intrusive igneous rocks form from magma that cools and solidifies beneath the Earth's surface, while extrusive igneous rocks form from lava that cools and solidifies on the Earth's surface. Metamorphic rocks are formed from the alteration of pre-existing rocks under high heat and pressure. Fossils are not typically found in these types of rocks.

What rock-forming process occurs when hot magma comes near and heats up rock?

Answer: Contact metamorphism.
Contact metamorphism occurs when hot magma comes near and heats up rock. This process happens when the heat from the magma causes the surrounding rock to undergo changes in mineralogy, texture, and structure. The high temperatures and pressure from the magma cause the existing rock to recrystallize and form new minerals. This process typically occurs in the vicinity of igneous intrusions, such as when magma intrudes into existing rock formations.

A student obtains a cup of quartz sand from a beach. A saltwater solution is poured into the sand and allowed to evaporate. The mineral residue from the saltwater solution cements the sand grains together, forming a material that is most similar to:

Answer: A sedimentary rock.
When the saltwater solution is poured into the sand and allowed to evaporate, the mineral residue from the solution acts as a cementing agent, binding the sand grains together. This process is similar to the formation of sedimentary rocks, where sediments are compacted and cemented together over time. Sedimentary rocks are formed through the accumulation and lithification of sediment, and in this case, the sand grains being cemented together by the mineral residue aligns with the characteristics of sedimentary rock formation.

The most common intrusive igneous rock is:

Answer: Granite
Granite is the most common intrusive igneous rock because it is formed from the slow cooling and solidification of magma deep within the Earth's crust. This slow cooling allows for the formation of large mineral crystals, giving granite its characteristic coarse-grained texture. Granite is widely distributed and can be found in continental crusts around the world. It is commonly used as a building material due to its durability and attractive appearance.

True or False: A metamorphic rock that has grains arranged in bands is said to be non-foliated.

Answer: False
A metamorphic rock that has grains arranged in bands is said to be foliated, not non-foliated. Foliation refers to the alignment of minerals or grains in a rock, creating parallel bands or layers. Non-foliated rocks lack this alignment and typically have a more uniform texture. Therefore, the correct answer is False.
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