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luke's sci midterm

Science midterm for seventh grade SRB

QuestionAnswer
What are the two major groups of minerals? Silicates and nonsilicates
The color of the powder that a mineral leaves on a piece of white, unglazed porcleain is called the mineral's? Streak
A naturally formed, inorganic solid that has a definite crystalline structure. Mineral
The way a mineral reflects light. Luster
Layers in sedimentary rock. Strata
A natural material whose concentration of economically valuable minerals is high enough to be mined profitably. Ore
A naturally occuring solid mixture of one or more minerals of organic matter. Rock
The most common type of unconformity. Disconformity
What era ended with the largest mass extinction in Earth's history? Paleozoic era
The largest division of geologic time. Eon
Rock that forms as a result of volcanic activity at or near the Earth's surface. Igneous rock
When magma cools quickly, what kind of texture does rock have? Fine-grained
The special property that causes some minerals to glow is... Fluorescence
Tear-shaped bodies that form when magma moves upward. Pegmatites
During which eon were the earliest known rocks formed on Earth? Archean eon
The idea that geologic processes occuring now are the same as those in the past. Uniformitarianism
True or false, minerals can be liquids? False
When you say that an object is shiny or dull you are describing its... Luster
A mineral's resistance to being scratched. Hardness
When a tree is petrified, the wood turns into... Minerals
What era do we currently live in? The Cenozoic era
What do scientists think caused the extinction of dinosaurs? Global climate change
Metamorphic rock in whic mineral grains are not arranged in planes or bands. Nonfoliated metamorphic rock
What determines the composition of a rock? The minerals it is made of
Process in which crystals in minerals change in size or composition. Recrystallization
Three classes of nonsilicate minerals are... Oxides, carbonates, and native elements
Minerals such as gypsum and halite are left behind when _________________ evaporates. Salt water
The main component of most rocks on Earth. Feldspar
The special property of some minerals that can be detected by a Geiger counter. Radioactivity
What is an atom with the same number of protons, but a different number of neutrons. Isotopes
The phrase "younger over older" csn be used for what principle? Superposition
Fossil from a specific time period. Trace fossil
Mold filled with sediment. Cast
Science that combines uniformitarianism with catastrophism. Geology
What process changes rock on Earth's surface? Erosion
What kind of sedimentary rock is made from dissolved minerals? Chemical sedimentary rock
The process by which new rock forms from old rocks. The rock cycle
Would an asteroid hitting the Earth be a catastrophe? Yes
What are insects commonly caught in? Amber
The size, shape and position of grains that make up a rock. Texture
Layers found in sedimentary rock? Strata
Igneous rock that cools on the Earth's surface. Extrusive igneous rock
Molten rock that squeezes into exsisting rock is... A fault
In the a series of undisturbed rock layers, the ____ rocks are on the bottom. Oldest
Preserved footprints are examples of _____ fossils. Trace
What method of dating rocks is used to date the Earth's oldest rocks? The uranium-lead method
What process compares one rock layer with others in a sequence? Relative dating
A missing layer of rock. Disconformity
Mark or cavity. Mold
Fossil from a specific time period. Index fossil
Created by: lukemoo
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