Morphing
These two environmental forces—acting deep underground without entirely melting the rock—are the primary agents required to create any metamorphic rock.
What are heat and pressure?
This standard scale ranges from 1 to 10 and is used by geologists to measure a mineral's resistance to being scratched.
What is the Mohs Hardness Scale?
Placed prominently at the top of a graph, this component should explicitly name both variables and state exactly what the visual data is showcasing.
What is the Title?
Formed from lava that erupts onto Earth's surface, this specific class of igneous rocks cools very rapidly, resulting in tiny, microscopic mineral crystals.
What are extrusive (or volcanic) igneous rocks?
This two-step process involves heavy layers of sediment weighing down on lower layers, followed by minerals acting as a natural glue to bind the fragments together.
What are compaction and cementation (or lithification)?
This term describes the texture of metamorphic rocks like gneiss or schist, where mineral grains align into visible parallel layers or bands due to directed pressure.
What is foliation (or a foliated texture)?
This identification test involves rubbing a mineral across an unglazed porcelain plate to observe the true color of its powder, which often differs from its external color.
What is a streak test?
When setting up your Axes, this is the specific mathematical line where the independent (or manipulated) variable must always be placed.
What is the X-axis (or the horizontal axis)?
Because it remains trapped deep underground within magma chambers, this type of igneous rock cools incredibly slowly, allowing large, coarse mineral grains to grow.
What are intrusive (or plutonic) igneous rock
This major group of sedimentary rocks is formed from the physical fragments of pre-existing rocks, and includes examples like sandstone, shale, and conglomerate.
What are clastic sedimentary rocks?
This specific type of metamorphism occurs over massive geographic areas, typically where tectonic plates collide to build mountain ranges, rather than just localized baking near magma.
What is regional metamorphism?
Unlike fracture, which results in jagged or irregular surfaces, this term describes a mineral's tendency to split cleanly along flat, parallel planes of structural weakness.
What is cleavage?
According to the "L" in TAILS, when you label an axis to describe the data, this critical piece of measurement info must always be included inside parentheses right next to it.
What are the units (or units of measurement)?
Rich in silica and aluminum, rocks with this chemical composition—like granite—are typically light-colored and are the primary building blocks of Earth's continental crust.
What is felsic?
Because sedimentary rocks form at relatively low temperatures and pressures on Earth's surface, they are the only type of rock capable of preserving these ancient biological remains.
What are fossils?
When sedimentary limestone is subjected to intense metamorphism, its microscopic calcite crystals recrystallize and grow into this non-foliated rock commonly used for countertops and sculptures.
What is marble?
This property describes how light interacts with a mineral's surface, and it is broadly categorized into two main groups: metallic and non-metallic.
What is luster?
This rule dictates that the spacing or mathematical jump between lines on a single axis must always remain equal—meaning you cannot switch from counting by 2s to counting by 10s halfway up.
What are the Intervals?
This composition describes dark, dense igneous rocks that are rich in iron and magnesium, with basalt being the most common extrusive example found on the ocean floor.
What is mafic?
This specific sub-category of sedimentary rocks forms when mineral-rich water—like an ancient sea or lake—evaporates, leaving behind solid mineral crystals like rock salt or gypsum.
What are crystalline (or evaporite) sedimentary rocks?
This high-grade, intensely banded metamorphic rock represents a much higher level of temperature and pressure changes than its lower-grade relatives like slate or phyllite.
What is gneiss?
This mineral will scratch glass (hardness=5.5), but not pyrite.
What is Orthoclase (or Plagioclase Feldspar)?
A graph that is describing a decreasing value that stabilizes after a given amount of time (ie a chai latté's temperature going from boiling to room temperature).
What is Indirect to Static?
If a geologist discovers a coarse-grained, dark-colored igneous rock deep in a mountain range, it would be classified as this specific type of rock—the intrusive equivalent of basalt.
What is gabbro?
This biochemical sedimentary rock forms over millions of years from the heavily compacted, carbon-rich remains of ancient plant matter that died in stagnant swamp environments.
What is coal?