Презентация, доклад на тему The most beautiful caves in the world

Acid rain consist of rainwater mixed with carbon dioxide. As this acid rain travels through the ground, it comes in contact with solid rocks. If the rock is made of limestone or dolomite, the water will react chemically until this rock slowly dissolves and hollow space is formed. As the space becomes bigger water passes through it until it accumulates and becomes a stream or underground river. Erosion and weathering starts which also helps in cave formation. After a thousand years, the hollow space is already big enough for a human to enter. And after a million years, chambers and columns due to stalactite (from the ceiling) and stalagmite (from the ground) formation becomes so spectacular giving birth to these amazing cave systems.

like to know their environment. So we have chosen an interesting topic: the most beautiful caves in the world.
Subject of study – caves all over the world.
Purpose of the study- to reveal the most beautiful caves of the world.
Objectives of the study:
-find interesting and beautiful caves;
-find information about them;
-choose the most interesting ones.
Research methods: study of the literature on the selected topic, material synthesis.