1.11 Summary

Rocks are classified into three types according to how they were formed. Igneous rocks are formed by crystallisation from the molten state; sedimentary rocks are deposited at the Earth's surface from water, air or ice; and metamorphic rocks are rocks of any origin that have been subsequently transformed (metamorphosed) by heat and/or pressure, often several kilometres below the Earth's surface.

Rocks are generally either crystalline, i.e. formed of interlocking mineral crystals, or frag
Author(s): The Open University

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1.1 Distributed systems

The past four years have seen an amazing growth of interest in distributed systems which address the business needs of companies and which use network technology – primarily the technology employed in the internet. In that period newspapers, magazines and even government pronouncements have frequently mentioned the huge business prospects for companies who embrace internet technologies. There is now a burgeoning literature on e-commerce aimed at the business person and the manager and a thr
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 Marco the Pencil Teaches about Atoms
This computer animated video is great for children to learn science facts about protons and neutrons. Marco the Pencil helps Kevin study for his science test.  (This is a sample clip from the DVD). Run time 02:46.

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Checklist - Language Assistantship
This is a resource released as part of the E-Portfolio Toolkit based on experience of developing the “Year Abroad E-Portfolio”, undertaken by the School of Languages at Leeds Metropolitan University.
Author(s): Mara Fuertes-Gutiérrez,Juan Muñoz López,Janet P

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http://creativecommons.org/licenses/by-nc-sa/3.0/

Learning outcomes

By the end of this unit you should be able to:

  • work with simple ratios;

  • convert between fractions, decimals and percentages;

  • explain the meaning of ratio, proportion and percentage;

  • find percentages of different quantities;

  • calculate percentage increases and decreases;

  • calculate average speeds in given units and find speeds, distances and times for travel at constant speed;

  • convert units;
    Author(s): The Open University

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    Except for third party materials and/or otherwise stated (see terms and conditions) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Share

2.3.3 Differences between people and places

I said at the beginning of this section that the average individual and household carbon footprints for a country conceal the differences within that country. These differences in carbon footprints are related to income and can be enormous, but difficult to quantify.

For example, in India the 2004 average carbon footprint of 1.2 tonnes CO2 per person per year hides the differences between: middle-class Indian households living in air-conditioned apartments and owning a televi
Author(s): The Open University

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6 Self-assessment questions

Question 1

Give three reasons why many people in the world face an increasingly severe shortage of fresh, safe water.

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Author(s): The Open University

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Isaac Newton and his enemies

Authors: 
Professor David Wolfe