Q: What is the term for the dark brown or black coating found on exposed desert rocks, which is formed of iron and manganese oxides?


Read this paragraph and choose the correct option from the provided answers:

Exposed rocks in desert areas often develop a dark brown or black coating called desert varnish ( Figure below ). Wind transports clay-sized particles that chemically react with other substances at high temperatures. The coating is formed of iron and manganese oxides.

 Choices:

- desert patina

- desert shadow

- desert rust

- desert varnish


A:
desert varnish