Rocks that are formed from molten rocks become solid
100
What type of materials can make up sediments?
pieces of rocks, minerals, plant, and animal remains
100
what are some ways people use metamorphic rocks?
gemstones, pencils, materials for builders and artist
200
How are rocks and minerals different?
Minerals have an orderly crystal structure and a definite composition, but rocks do not
200
What is the main difference between intrusive and extrusive igneous rocks?
intrusive rocks cool slowly below Earth's surface, while extrusive rocks cool quickly on Earth's surface
200
How does most sedimentary rock develop ?
sedimentary rock develops as layers of sediments build up on land or underwater
200
Do rocks melt during metamorphism?
No, they remain solid
300
Which rock types are most common within Earth's crust?
Which rock types are most common at Earth's surface?
1. igneous and metamorphic
2. sedimentary
300
What are the two major properties used to classify igneous rocks?
crystal size and silica content
300
How is a rock like coal developed?
Plant remains are buried under layers of sediment. The weight of the sediments above presses the plant material into coal.
300
What is needed for metamorphic changes in rock over a small area?
either high temperature or high pressure
400
Would you expect to find sedimentary rocks deep in Earth's surface? Why or why not?
Sedimentary rocks would not be found deep in Earth's crust because it forms at the surface. When it's deep inside, it changes into igneous or metamorphic rocks.
400
Why ca intrusive igneous rocks be left behind when surrounding rocks are worn away?
Igneous rocks can be harder than other rock types and may not wear away as quickly
400
What are the two processes that can change sediments into rocks?
pressure and cemented by new minerals to form rock
400
What conditions cause sedimentary rock or igneous rock to change into a metamorphic rock?
increasing temperature or pressure or both
500
How does coal differ from most rocks?
Coal is not composed of minerals.
500
How do the high temperatures whithin Earth affect the colling of magma?
the high temperature allow magma to cool slowly
500
Describe how a sedimentary rock can show how fast water was flowing when its sediments were laid down.
rock made of large pieces show that water was moving quickly
500
How do new minerals grow within existing rocks?
What is heat and pressure can break bonds in minerals and the atoms can then join new ways to make new minerals