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WorksheetsScience ch.8
Total questions: 25
Worksheet time: 13mins
Meaning of Geology
study of the universe
study of the ground
study of earth
Erosion meaning
blah blaj
the process of water, ice, and wind breaks down rocks
the process of rocks, gas, and fire breaks down rocks
3 types of rocks
igneous
mesozoic
metamorphic
cambrian
sedimentary
what is a metamorphic rock?
a type of rock that forms from the cooling of molten rock at or below the surface
at type of rock that formed of hardened layers of sediments
a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions
What is and igneous rock
a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions
at type of rock that formed of hardened layers of sediments
a type of rock that forms from the cooling of molten rock at or below the surface
what is a sedimentary rock?
a type of rock that forms from the cooling of molten rock at or below the surface
at type of rock that formed of hardened layers of sediments
a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions
What is relative age?
the age of a rock given as the number of years since the rock formed
the age of a rock compared to the ages of rock layers
what is absolute age
the age of a rock compared to the ages of rock layers
the age of a rock given as the number of years since the rock formed
what is the law of superposition used for?
determining the absolute age of rocks
determining the relative age of rocks
What does extrusion mean?
an igneous rock layer formed when lava flows onto Earth's surface and hardens.
an sedimentary rock layer formed when lava flows onto Earth's surface and hardens.
an metamorphic rock layer formed when lava flows onto Earth's surface and hardens.
What is index fossil?
Fossils of widely distributed organisms that lived during only a long period.
Fossils of widely distributed organisms that lived during only a short period.
What are inclusions?
an igneous rock layer formed when lava flows onto Earth's surface and hardens.
A piece of rock that is contained in another rock; an inclusion is younger than the rock containing it
What is half-life?
the time it takes for half of the atoms in a radioactive element to produce
the time it takes for half of the atoms in a radioactive element to decay
What is Carbon-14 Dating?
a radioactive form of oxygen
a radioactive form of carbon
has only half-life of 5,730)
has half of 1.3 billion years ago
What is Potassium-40 Dating?
has a half- life of 1.3 billion years ago
has a half-life of 5,730
used for dating rocks
used for painting rocks
How old is Earth?
1.3 billion years old
4.6 billion years old
5,730 billion years old
What does that theory of plate tectonics state?
that Earth's plates moves very fast in the same directions
that Earth's plates move slowly in various directions
What is Continental Drift?
the very slow motion of the continents
the very fast motion of the continents
What are Eras?
One of the 3 long units of geologic time between the Precambrian and the present
One of the units of geologic time into which geologists divide eras
What are periods?
One of the units of geologic time into which geologists divide eras
One of the 3 long units of geologic time between the Precambrian and the present
What was the Precambrian Times main organisms?
bacteria, photosynthesis
reptiles
mammals
What first appeared in the Paleozoic Era?
amphibians, invertebrates, and fish
bacteria, photosynthesis
reptiles, dinosaurs
What was the Cambrian Explosion?
a time where a lot of different organisms evolved
a time where a lot of organisms became extinct
What was the Mesozoic Era?
Age of Bacteria and Photosynthesis
Age of Reptiles and Dinosaurs
Age of Mammals
What happened during the Cenozoic Era?
Mammals evolved
Reptiles evolved
Amphilbians evolved
