1. Many of the sculptures on old churches have lost their '
' edges and the features much more rounded mainly due to chemical
.
2. The speed of weathering depends on how
the rain is, and how much rain and
the stone structures are hit by.
3. 'Softer' stone like
show much more erosion than harder stones like
.
4. Rainwater is naturally acidic due to the dissolved gas
which is formed in
and burning
fuels.
5. Unfortunately many fuels contain sulphur compounds which burn with the fuel to form the more acidic gas
and acidic
oxides are also formed too.
6. These other gases increase the acidity of rain and so increase the
of erosion of stone and
structures and they are also
to living organisms.
7. Rocks made of
like limestone and marble, are eroded particularly fast because they readily react and
in acids.
8. This produces very eroded
and spectacular limestone caves and
.
multi-word fill quiz 9Gwf2 on "Environmental chemistry"