Kolgruve




Færøysk kolgruve ved Hvalba.


Ei kolgruve er ei gruve der ein hentar ut steinkol, anten under eller over jorda.


I 2004 var verdsproduksjonen av kol på ca. 4,6 milliardar tonn steinkol, av dette hadde Kina ca. 40 prosent og USA ca. 20 prosent. Steinkol blir au foredla til koks, som blant anna blir bruka til framstilling av stål. Kol er ofte brukt i energiverk, i varmeanlegg eller direkte i heimen. Nye metodar og maskinar blir ofte bruka til å grava ut kol.


Kol ligg under jordoverflata og er danna av organisk materiale som døde dyr og planter, som har eksistert for millionar av år sidan. Det finst stadig store mengder av kol, som stadig er den mest viktige energikjelda i verda. Gasseksplosjonar og ras er ofte årsak til mange dødsulykker i minesjaktene. Særleg før i tida var dødsrisikoen stor.



Bakgrunnsstoff |



Kjelder |



  • Denne artikkelen bygger på «Kulmine» frå Wikipedia på dansk, den 26. januar 2011.







-

Popular posts from this blog

Was Woodrow Wilson really a Liberal?Was World War I a war of liberals against authoritarians?Founding Fathers...

Image
Do VLANs within a subnet need to have their own subnet for router on a stick? What are the differences between the usage of 'it' and 'they'? Dragon forelimb placement How do we improve the relationship with a client software team that performs poorly and is becoming less collaborative? What typically incentivizes a professor to change jobs to a lower ranking university? How to write a macro that is braces sensitive? Modeling an IPv4 Address Writing rule stating superpower from different root cause is bad writing Can I ask the recruiters in my resume to put the reason why I am rejected? Approximately how much travel t...
Read more

Integral that is continuous and looks like it converges to a geometric seriesTesting if a geometric series converges by taking limit to infinitySummation of arithmetic-geometric series of higher orderGeometric series with polynomial exponentHow to Recognize a Geometric SeriesShowing an integral equality with series over the integersDiscontinuity of a series of continuous functionsReasons why a Series ConvergesSum of infinite geometric series with two terms in summationUsing geometric series for computing IntegralsLimit of geometric series sum when $r = 1$

Image
Why did Rep. Omar conclude her criticism of US troops with the phrase "NotTodaySatan"? Contradiction proof for inequality of P and NP? What is meant by electrons moving to lower potential energy? Negative Resistance Zonal Statistics is returning null values in ArcGIS Desktop? Why do distances seem to matter in the Foundation world? Injection into a proper class and choice without regularity A faster way to compute the largest prime factor "Whatever a Russian does, they end up making the Kalashnikov gun"? Are there any similar proverbs in English? Do I need to watch Ant-Man and the Wasp and Captain Marvel before watching Avengers: Endgame? How bug prioritization works in agile projects vs non agile Is this a typo in Section 1.8.1 Mathematics for Computer Science? Drawing a german abacus as in the books of Adam Ries How to have a sharp product image? Creating a chemical industry from a medieval tech level without petroleum Partitioning va...
Read more

Why is system upgrade showing unstable version when upgrading in backend?System Settings > System Upgrade link does not existsComposer Error While upgrading magento version 2.1.6 to 2.2.2How to upgrade magento 1.4.0.0 to above 1.6 versionIssue with upgrading Magento Version from 2.1.7 to 2.1.12Magento 2.2.5: Error on running setup: upgrade after upgrading Magento from 2.2.2 to 2.2.5Are there any Magento Code Release Notes?getting error when upgrading from Magento 2.1.5 to Magento 2.2.6Will the installed third party plugins upgrade when we upgrade Magento version via composerWhy PHP Settings Check and Checking Component Dependency showing error during Magento 2.3 upgrade?Fatal error: Out of memory (in composer) during upgrade Magento2.2.1 to Magento 2.3 when run composer update command

Image
Can a Knock spell open the door to Mordenkainen's Magnificent Mansion? Writing in a Christian voice Would this string work as string? Turning a hard to access nut? New Order #2: Turn My Way Capacitor electron flow How can I, as DM, avoid the Conga Line of Death occurring when implementing some form of flanking rule? How to preserve electronics (computers, ipads, phones) for hundreds of years? Pre-Employment Background Check With Consent For Future Checks Started in 1987 vs. Starting in 1987 Calculate Pi using Monte Carlo What (if any) is the reason to buy in small local stores? How to test the sharpness of a knife? Center page as a whole without centering each element individually Unfrosted light bulb Trouble reading roman numeral notation with flats Why is implicit conversion not ambiguous for non-primitive types? Why would five hundred and five same as one? What is the period/term used describe Giuseppe Arcimboldo's style of painting? Wha...
Read more