Our understanding of submarine volcanic eruptions has improved substantially in the past decade owing to the recent ability to remotely detect such events and to respond rapidly with brief surveys and sampling at the eruption site. But these data are necessarily limited to observations after the event. In contrast, the 1998 eruption of the Axial volcano on the Juan de Fuca ridge was monitored by on site sea-floor instruments. One of these instruments, which measured bottom pressure, was overrun and entrapped by the 1998 lava flow. The instrument survived and was later discovered. The data recorded by this instrument reveal the duration, character and effusion rate of an eruption on a mid-ocean ridge.
According to the passage, with the aid of instruments placed on the ocean floor, ____.
a lot of data have been collected concerning oceanic eruptions throughout the world
it is now possible to anticipate when volcanic eruptions are going to take place
scientists can now watch the volcanic activities at an eruption site while they are actually happening
a great deal of information concerning the eruption of the Axial volcano was obtained
we have come to understand the part played by bottom pressure during a volcanic eruption
According to the passage, it is only within the last ten years or so that ____.
it has been possible to monitor volcanic eruptions under the sea
the studies made of the Axial volcano have given rise to a great deal of controversy
scientists have realized how important under ocean volcanic activity is
the effusion rate of the Axial volcano has increased noticeably
the geological causes of volcanic activity under the sea have been a major scientific concern
We can conclude from the passage that the study of submarine volcanic activity ____.
is frequently made more difficult due to the sudden uncontrolled flow of lava
is concerned more with the duration of an eruption than with its other aspects
has so far made very little progress
has focused primarily upon the Axial volcano ever since 1998
has been greatly improved by early detection of such activity