[DOC] [TLE] The 3 basic rock types - U. of Oregon [PAR] What are the 3 basic types of rocks? ... put into one of two main categories of 
human being, all rocks can be put into one of ... made of igneous rock - at least at 
the surface where our planet is exposed to the ... Clastic: your basic sedimentary 
rock. ... These are very common in arid lands, where seasonal "playa lakes" 
occur in... [DOC] [TLE] sedimentary rock | Britannica.com [PAR] Sedimentary rocks are the most common rocks exposed on the Earth's surface ... 
and two fundamentally different kinds of sediment and sedimentary rock: (1) ... 
and sedimentary rock comprises 75 percent of the land surface and well over 90 
.... that only three varieties account for the bulk of all sedimentary rocks: mudrock,
... [DOC] [TLE] Chapter 4 Rocks and Minerals - Volcano World [PAR] Chapter 4 focuses on Rocks and Minerals, looking at types of rocks. ... Notice the 
different mineral crystals that make up the rock, granite. .... Quartz is a mineral 
made from one substance SiO2 (Silicon Oxide) that has a definite chemical ..... 
Sedimentary rocks form a thin layer of rock over 75 per cent of the Earth's surface. [DOC] [TLE] Minerals, Rocks & Rock Forming Processes [PAR] These 9 minerals are all silicates, and are also called the rock forming minerals. 
... black) to greenish color, and the last one (Ca-Plagioclase) is light to 
transparent. ... Geologists distinguish three main groups of rocks (with of course 
numerous .... because about 75% of the earth's exposed land surface consist of 
sediments... [DOC] [TLE] Rocks [PAR] Rocks are naturally formed, consolidated material composed of grains of one or 
more ... Many rocks have a different color on the weathered surface than on a 
fresh break. ... Sedimentary rocks make up 75 percent of the rocks at the earth's 
surface but only 5 .... All three types are exposed in the large granitic plutons of 
Idaho. [DOC] [TLE] Earth Materials and the Cycle of Rock Change - Wiley [PAR] The elements oxygen and silicon account for about 75% of the earth's crust, while 
the ... The rocks of the earth's crust are grouped into three major classes: igneous
, ... called mineral alteration when exposed to air and water at the earth's surface. 
... low-lying land areas to be compacted and hardened into sedimentary rocks. [DOC] [TLE] Rock Types - Utah Science [PAR] Igneous rocks are sub divided into two types of classifications:"intrusive" and ... 
The quick cooling doesn't allow the formation of large crystals, so most extrusive 
rocks have small crystals or none at all. ... Sedimentary rocks account for 75% of 
the rocks exposed at the earth's ... There are three types of sedimentary rocks. [DOC] [TLE] Sedimentary rock - Wikipedia [PAR] Sedimentary rocks are types of rock that are formed by the deposition and 
subsequent ... Naming depends on the dominance of the three most abundant 
components ... Most authors presently use the term "mudrock" to refer to all rocks 
composed ... Chemical sedimentary rock forms when mineral constituents in 
solution... [DOC] [TLE] GG101 Sedimentary Rocks [PAR] We know that sedimentary rocks cover about 75 percent of all of the continental ... 
We know, for example, that the land surfaces on the continents are formed from 
.... To geologists a layered sequence of sedimentary rock like this is a historical ... 
One of the most common forms of sediment is referred to as "clastic" from the... [DOC] [TLE] Earth's crust - Simple English Wikipedia, the free encyclopedia [PAR] The crust is made up of different types of rocks: igneous, metamorphic, and ... The 
upper part of the mantle is made up of peridotite, a rock denser than rocks 
common in ... One is the continental crust (under the land) and the other is 
oceanic crust ... The crust is the coldest layer upon all the layers because it is 
exposed to the... [DOC] [TLE] Earth Science Facts - Explorit Science Center [PAR] No-one has ever penetrated Earth's mantle to reach the core to investigate what it 
is

Question: Of the 3 main classes of rock, this one accounts for about 75% of all the exposed rocks on land
Answer: Sedimentary