World Geography
The ozone layer at high altitude contains

only ozone (O3)
atomic oxygen (O) and ordinary oxygen (O2)
mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3)
only ordinary oxygen (O2)

ANSWER DOWNLOAD EXAMIANS APP

World Geography
In which rocks does most of the formation of caves take place?

Limestone
Sandstone
Granite
Quartzite

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP