Many countries around the world have no caves. This is not because there are no hills or mountains in those places. Some of the world's biggest mountains have no caves because they are not made of the right sort of stone. But the low, limestone hills of the north of England and the south of France are full of interesting caves. For hundreds of years, people have enjoyed finding caves and going inside them. This sport is called "caving", and the people who do it are called "cavers. Cave exploration began in Europe and even today most cavers come from there. That is why we know so much about European caves. But in many other parts of the world there are hundreds of caves which few people have ever visited. For example, there are many caves in Russia and Afghanistan, in Albania and China, but not many cavers in those countries and it is often very difficult for foreign cavers to get permission to visit. 1/ Why don’t many countries around the world have caves? --> 2/What are the people who find caves and go inside them caved?--> 3/ Do Russia and China have many caves?--> 4/ Why don’t some of the world's biggest mountains have caves? --> 5/What is called "caving"?--> giúp mình vs ạ mai thi ùi hứa sẽ vote 5 sao