560fd65f_KS3_Ex___Earth_Science_On_Site__uitable_questions_at_this_site
[Acceptable responses] There will be no pebbles of sedimentary rocks. Most of the pebbles from upstream are metamorphic rocks of various kinds. These tend to be more angular, indicating they have not been transported far by the river. A few (around 10%) are coarse grained igneous granite pebbles. These tend to be more rounded perhaps because they have travelled from the granite outcrops further upstream, but also because they are made up of minerals like feldspar and mica which can break (cleave) more easily. There may be one or two pebbles of mineralised deposits
Bring the group together and discuss their findings.
MEL/KS3/Ex - Earth Science On-Site
Suitable questions at this site