The scientists collected and studied information from two satellites. Some of the data came from the European Space Agency’s Cryo-2 satellite. It was placed in Earth’s orbit to watch sea ice. The other satellite is the American space agency’s Jason-1. It is studying the surface of the oceans. Scientists combined the satellite data with images gathered by sonar ( 声呐:利用声波探测水下物体的装置或系统) equipment on ships. Sonar works by sending sound waves through the water. When the sound waves hit an object, its presence is confirmed.
“That enables us to look at smaller-scale features and also features that are buried by sediments in the ocean basins.”
The new map shows the sea floor as it has never been seen before. It shows thousands of underwater mountains and places where continents pulled apart. It shows where earthquakes were active many years ago. They all are buried deep underneath the ocean floor.
In one place, three mountain ridges join at the same area. Huge tectonic (构造的lates can be seen clearly there.
29. The passage is likely to _____.
A. be an advertisement
B. appear on VOA
C. make a comment on radar
D. appear on SKYPE
30. What will be mentioned in the following paragraph, according to the last paragraph? _____.
A. The detailed information about the place.
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