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Jonathan's user avatar
Jonathan
  • Member for 3 years, 10 months
  • Last seen more than 1 year ago
  • England, UK
4 votes
2 answers
147 views

Feldspar content of coarse-grained igneous rocks

4 votes
1 answer
995 views

When does a stream become a river?

3 votes
2 answers
248 views

Quartz mineral category

1 vote
0 answers
51 views

puzzling statement on earth history!