Earth Science

1,)Felsic
magmas form light-colored, silica-rich rocks. Mafic magmas form dark-colored, rocks rich in iron and magnesium.
Felsic magma is thick and slow-moving. It contains large amounts of silica and smaller amounts of the elements calcium, iron, and magnesium. Compared with felsic magma, mafic magma is hotter, thinner, and more fluid, containing large amounts of iron and magnesium and much lower amounts of silica.



A rock is a group of minerals bound together. The rock cycle is the repeated series of events by which rock gradually and continually changes from one type to another. (Three major types of rocks are formed, broken down, and reformed in a recurring process called the rock cycle) 1)Igneous 2)Sedimentary 3)Metamaorphic


1,)The formation of clastic rocks begins with the movement and relocation of the fragments. The majority of these rock fragments are collected and moved by running water. Larger pebbles and gravels are often the first to drop out and settle in the shallow water near shore. Next to settle are the smaller sands and finally, in clam water, the silts and clays. The sorting process is not always perfect. Sand is sometimes found mixed with pebbles and gravels in shallow water or with silts



2,)When they are tying to become the Igneous rocks, it will met different pressure and temperature…so these terms will make many kind of rocks which has different textures. 3,)igneous rock compositions do not occur as distinct categories but as a range, loosely separated by gradual boundaries.
Cementation
Stratification
Fossil
How
do metamorphic rocks form and what are their characteristics?
Metamorphic
rocks are formed from preexisting rocks called parent rocks. A metamorphic rock often resembles its parent rock.

3,)STRATIFICATION A change in the type of sediment being laid down in one place results in the formation of a new rock layer. FOSSILS Sedimentary rock often contains fossils. A fossils is the remains, impression, or any other evidence of a plant
An
organic sedimentary rock forms from sediments consisting of the remains of plants and animals. Common organic sedimentary rocks are limestone and coal. Although coal consists primarily of carbon, it is formed
Granodiorite
is a coarsegrained rock with a transitional composition between that of granite and diorite. Scientists hypothesize that these rocks are similar to those of Earth’s mantle.
three major types of sedimentary rocks are categorized by the way they form and by their distinctive features.
Clastic
sedimentary rocks are formed formed form fragments of other rock. Chemical sediments form when these minerals precipitate, or fall out of solution.

Felsic
Mafic Pluton
Batholith
How
do the different types of sedimentary rocks form? Describe Clastic rock, Chemical rock and Organic rock.
The

RIPPLE MARKS AND MUD CRACKS Two relatively common features of sedimentary rock are ripple mark and mud cracks. Ripple marks are sand patterns formed by the action of winds, streams, waves, or currents.

2,)Chemical rock: The water in seas, lakes, swamps, and underground reservoirs often contains dissolves minerals. Chemical sediments form when these minerals precipitate, or fall out of solution. Common chemical sedimentary rocks are rock salt, rock gypsum, and some limestones.
Igneous
rock texture depends mainly on the rate at which magma cools.
In
general, any igneous intrusion---a rock mass that forms when magma colls inside Earth's interior ---may be called a pluton. Batholiths, the largest of all plutons, form the cores of many of Earth's mountain ranges.
4,)Different pressure, temperature, geographical and humidity. 5,)I think the obsidian would makea better arrowhead. Because the gabbo rocks are always coars-grained. 6,)We can waiting for the magma hardening, we can test the rocks.

NODULES, CONCRETIONS, AND GRODES Limestones and chalk often contain hard lumps of finegrained silica called nodules. Whitish, brown, or gray nodules are called chert; darker varieties are sometimes called flint.
Rock Igneous Magma Sedimentary Sediment Metamorphic Rock cycle

How
do igneous rocks form? How are they classified?
Igneous
rocks form from magma in distinct ways and can be classified based on mineral composition and texture.
Any
differences between the two are a result of the metamorphic process the parent rock undergoes. The process by which a rock's structure is changed by pressure,
Chapter 6 Rocks
---ຫໍສະໝຸດ Baidu--
6,1
Rock and Rock Cycle 6,2 Igneous Rocks 6,3 Different types of sedimentary Rock 6,4 Metamorphic Rock
What
is a rock? What is the rock cycle? Classified the rocks by which they are formed.
Organic
rock: An organic sedimentary rock forms from sediments consisting of the remain of plants and animals. Common organic sedimentary rocks are limestone and coal.


They can not follow the order to become kinds of rocks! Sometimes crustal movements force rocks deep into Earth. The rocks may become so hot that they melt into magma. The magma may then harden into igneous rocks to complete the rock cycle.