1. Acid rain was first coined in 1872 by an English scientist who observed signs of forest deterioration in the 19th century. 2. In the 1950s and 1970s, acid rain was discovered to be as acidic as lemon juice, damaging half the trees in Germany's Black Forest by 1984. 3. Acid rain is defined as a poisonous rain made acidic by air pollutants, and can occur through wet deposition via rain, sleet and snow, or dry deposition of acidic gases and dust particles carried by wind over long distances.

1. 1- Amr Mousa
2- Esraa Hosny
BY
3- Esraa Ezz
4- Azza Gamal

2. Introduction

4. Introduction

7. 1. The term “acid rain” was
coined in 1872 by Robert
Angus Smith “an English
scientist”
2. In the 19th century,
Forests showed
some signs of
deterioration
Introduction

8. 3. In 1950's acid rain was
discovered
4. It appear in Scotland as
acidic as lemon juice in 1974
Introduction

9. 5. In 1984, half of the trees in the famous black
forest in Germany had been damaged by acid rain.
Introduction

10. But now

11. • Acid rain is defined as “ A poisonous rain that has
been made acidic by certain pollutants in the air ”

14. Acid Rain
Wet Deposition Dry deposition
is another form of
acid deposition, and
this is when gases
and dust particles
become acidic
is rain, sleet, snow,
or fog that has
become more acidic
than normal

15. Both wet and dry deposition can be carried by the
wind, sometimes for very long distances