iGeo 2015, Писмен тест — Задача 3. Section A: Weathering — Question 3
12th International Geography Olympiad — Tver, Russia — 11–17 August 2015 — Written Response Test — Question and Answer Booklet · 11 август 2015 г. · 2 т.
Instructions for Students
- Fill in your name, team and iGeo student number on the front page of this Question and Answer Booklet.
- Fill in your iGeo student number in the boxes on top of the pages in this Booklet.
- This test consists of 6 Sections.
- The maximum total mark is 90. The mark for each question is given in the margin at the beginning of the question.
There is a maximum of 15 marks for each Section. - Answer all questions in the spaces provided in this Booklet.
- Check the backs of pages as questions are printed on both sides of a page.
- There are blank pages which you can use as additional space for your notes. If you use these pages for answers, please label them clearly with the question number.
- Where appropriate, please write sentences or phrases not single words.
- Give only the required number of answers (reasons, examples, etc.). For instance, if the question asks for 2 reasons and you give more than 2, only the first 2 reasons will be marked.
- The Resource Booklet contains Figures referred to in this Booklet.
- You may use a calculator during the test.
- Time: 180 minutes for students not educated in English, 150 minutes for students educated in English.
- Students not educated in English are allowed to use bilingual dictionaries during the test.
Good luck!
Instructions for Markers
- Check if the iGeo student numbers are on each sheet (on odd pages) before dividing up the Test.
- This test consists of 6 Sections.
- One whole Section per marker and double-checker. One Section per marker-pair who also perform double-checking for their Section. Some lengthy (more than 2 pages) Sections may be divided for two marker-pairs. The layout of the Marking Scheme follows this logic as much as possible.
- Check whether the answer continues outside the designated area, on the margins or as clearly marked on blank pages. No credits will be given to answers in the Resource Booklet.
- The maximum total mark is 90. The mark for each question is given in the left margin at the beginning of the question.
There is a maximum of 15 marks for each Section. - Get the hang of the full range of answers by reading through a few papers with your co-marker before you start your marking.
- These answers are not exhaustive. Credit any relevant answer.
- The Test uses two marking systems: point and level marking.
- Half marks can only be given where indicated.
- Mark only the required number of answers (reasons, examples, etc.). For instance, if the question asks for 2 reasons and there is more than 2, only the first 2 reasons should be marked.
- Please develop your own marking/correcting system (using +/-, x/0, √ marks), underlining, comments etc. to ease double-checking and sample marking.
- Put your mark next to the question number in the column on the left – it eases the work of the person who has to put the numbers into MS Excel.
- Please write down any inconsistencies of the Marking Scheme and additional answers or answers not accepted and hand them in after marking to improve the final Marking Scheme.
- The Moderators (Sue and Anu) will sample the marking of all teams.
Условие
Account for 2 ways in which biological weathering can occur.
Решение
Answers must be written in sentences or phrases; ‘roots’ does not gain a mark.
- Trees put down roots through joints or cracks in the rock in order to find moisture. As the tree grows, the roots gradually prize the rock apart.
- Even the tiniest bacteria, algae and lichens produce chemicals that help break down the rock on which they live, so they can get the nutrients they need.
- Many animals, bore into rocks for protection either by scraping away the grains or secreting acid to dissolve the rock.
Оригинал в Архива: 2015WRT-QuestionBooklet.pdf · официални решения: 2015WRT-Marking.pdf