1 . Animal appear to predict earthquakes by sensing electricity in the air — the first study to find reliable evidence of the phenomenon has shown.
Cameras revealed an “amazing” drop in the number of animals up to 23 days before a major quake hit their rainforest home at Yanachaga National Park in Peru. Lead scientist Dr Rachel Grant, from Anglia Ruskin University, said, “The results showed that just before the earthquake, animals’ activity dropped right down.”
On a normal day the cameras placed around Yanachaga National Park record between 5 and 15 animals. But in the 23 days before the earthquake, the number of animals dropped to five or fewer per day. No animals were photographed at all on five of the seven days immediately before the quake.
Another study showed that animal activity remained normal in the park over a different period when seismic (地震的) activity was low. Co-author, professor Friedemann Freund, said, “The cameras were located at an altitude of 900 meters. If air ionization occurred, the animals would escape to the valley below, where there were fewer positive ions ( 离子). With their ability to sense their environment, animals can help us understand small changes that occur before major earthquakes.”
Other evidence suggested that before the earthquake, the air around the high mountain sites filled with positive ions that can be produced when rocks are placed under stress. Positive ions have been known to cause ill effects in humans as well as animals. Scientists believe the animals were made to feel uncomfortable by the positive ions, leading them to avoid the area. They are thought to have escaped to lower ground, where the air was less ionized. The findings may help experts develop better short-term seismic forecasts.
1. How did scientists conduct the study?| A．By comparing different animals’ habits. |
| B．By observing animals in high mountains. |
| C．By explaining the positive ion phenomenon. |
| D．By analyzing images of animals they obtained. |
| A．The ground at a lower altitude is less ionized. |
| B．Cameras normally record more animals per day. |
| C．Earthquake warnings can be detected in lower places. |
| D．The activity of animals and earthquakes is consistent. |
| A．The findings make for accurate seismic forecast. |
| B．Animals tend to be uneasy with more positive ions. |
| C．Positive ions make humans and animals depressed. |
| D．All the animals remain abnormal before the earthquake. |
| A．Negative Influence of Positive Ions. |
| B．Ions’ Destruction to the Environment. |
| C．Animals’ Behavior Before Earthquakes. |
| D．Creatures’ Ability to Predict Earthquakes. |
