SECTION 4
Questions 31-33
Choose the correct letter, A, B, or C.
31 Caves are
A Often ignored.
B Mostly in remote areas.
C Often difficult to explore.
32 People who explore caves
A Mostly need to know about cartography
B Enjoy overcoming the difficulties.
C Usually know about cave sciences.
33 China has
A Probably the most undiscovered caves.
B A growing number of cave explorers.
C Some of the best documented caves.
Questions 34-40
Complete the table and notes.
Write NO MORE THAN TWO WORDS for each answer.
| Three Main Reasons for Cave Formation |
| Dissolution | Volcanic Lava Tubes | Action of Waves |
| mainly involves 34______ | - topmost surface cools down and 35______
- hotter lava continue to flow beneath
| waves pound in to cliffs then erode into 36______ or less rigid rocks. |
| Limestone caves | - often have formations made of 37______ carbonate
- e.g. stalactites, stalagmites, and 38______
|
| e.g. Lechuguilla | - finally revealed in 39______
- interestingly, formed from the 40______
|
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.