TOEFL Reading Academic Passage Practice #035 - Desert Varnish on Stone

Read an Academic Passage designed to build passage comprehension, evidence use, and efficient reading decisions.

5 QuestionsAbout 8 minutesMedium

What you will practice

Reading comprehension
Evidence and inference
Time management

Topic: Biology · Read an Academic Passage

Passage preview

In many dry landscapes, exposed rock surfaces carry a thin dark coating known as desert varnish. The coating contains clay particles together with compounds of manganese and iron. It develops extremely slowly, so a recently broken surface may remain much…

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