[DOC] [TLE] Petroleum - Wikipedia [PAR] Petroleum is a naturally occurring, yellow-to-black liquid found in geological 
formations beneath the Earth's surface, which is commonly refined into various 
types of fuels. Components of petroleum are separated using a technique called 
fractional ... The word petroleum comes from Greek:  (petra) for rocks and 
Greek:... [DOC] [TLE] Petroleum seep - Wikipedia [PAR] A petroleum seep is a place where natural liquid or gaseous hydrocarbons 
escape to the earth's atmosphere and surface, normally under low pressure or 
flow. ... Petroleum seeps are quite common in many areas of the world, and have 
been ... of surface petroleum was often included in location names that 
developed; these... [DOC] [TLE] Chemistry of Petroleum 3: Distillation of Hydrocarbons - Science ... [PAR] In this lesson, students learn how hydrocarbons in crude oil are distilled and ... 
use their Oil Refining student esheet to watch the introductory animation from ... 
The movie has an accompanying script that you can print out. ... that holds back 
the petroleum from coming out towards the surface is called a cap rock or seal 
rock. [DOC] [TLE] petroleum - National Geographic Society [PAR] Jan 15, 2013 ... Petroleum that has few metals or sulfur, for instance, tends to be lighter ... There 
are huge quantities of petroleum found under Earth's surface and in tar pits that ... 
It is almost always necessary to refine crude oil in order to make useful products. 
... Brent Crude is a mixture that comes from 15 different oil fields... [DOC] [TLE] Refining of Petroleum - Australian Institute of Petroleum [PAR] Petroleum is a complex mixture of organic liquids called crude oil and natural gas
, which ... As crude oil comes from the well it contains a mixture of hydrocarbon ... 
aromatic hydrocarbons are compounds that contain a ring of six carbon atoms ..... 
Aqueous effluent's consist of cooling water, surface water and process water. [DOC] [TLE] Petroleum - Oil and Natural Gas | energy4me [PAR] Over millions of years, the oil and gas that formed in the source rock deep within 
the ... Some seeped out at the Earth's surface, but most of the petroleum ... World 
oil production comes from more than 800,000 oil wells. ... The oil and natural gas 
we use today have been trapped deep inside the Earth for millions of years. [DOC] [TLE] petroleum | Britannica.com [PAR] The term is often restricted to the liquid form, commonly called crude oil, but as a..
. ... in nature that it has become customary to shorten the expression petroleum 
and ... Small surface occurrences of petroleum in the form of natural gas and oil ... 
that the use of refined oil for illuminants ceased to be of primary importance. [DOC] [TLE] Oil and Gas Industry Overview - Ihrdc.com [PAR] Crude oil is a liquid both underground and at normal surface conditions. ... Note 
that: The more atoms a molecule contains, the heavier it is. ... Naturally occurring 
hydrocarbons come from the decomposed remains of ... organic material was 
deposited on the Earth's surface and then transported to .... Crude Oil Refining. [DOC] [TLE] Condensate and Natural Gas Liquids - The Natural Food Hub [PAR] The gas usually associated with oil wells is therefore called 'dry gas'. Historically, 
the gas that bubbles out as the crude comes to the surface has ... or C18H38) 
They have to be refined in specialised refineries especially built to handle them. [DOC] [TLE] How gasoline is made - manufacture, making, used, parts, industry ... [PAR] Petroleum is formed from the remains of plants and animals that have been held 
under ... Gasoline is one of the products derived from distilling and refining 
petroleum. ... to further stabilize it and improve its color and smell in a process 
called "sweetening." ... The petroleum will float on the water and come to the 
surface. [DOC] [TLE] Oil [PAR] Apr 22, 2013 ... We are going to be talking about the oil that comes from crude oil here. ... crude 
oil contains a complex mixture of these hydrocarbons that are separated by a 
process called refining into the types of petroleum products (gasoline, diesel, ... 
plate

Question: Petroleum as it comes to the surface is called this; that's why it has to be refined
Answer: Crude oil