阅读理解。
Huguangyan National Scenic Spot
Huguangyan National Scenic Spot is in the south part of Zhanjiang. It is 18 km away from Zhanjiang. The
scenic spot mainly consists of the volcanic (火山) lake and the basalt (玄武岩) rock-groups around the lake.
The total area of the spot covers 13.6 square kilometers with a protection area of 38 square kilometers. The
water area of the lake amounts to 2.3 square kilometers. In 1997, The UNEarth Research Center and Earth
Research Institute of China Scientific Institute assessed (评估) that Huguangyan was formed about 140,000
to 160,000 years ago after the volcanic eruption (火山爆发). Lots of samples indicate that the lake is a rare
Maar Lake in the world after the volcanic eruption in the plain area.
Huguangyan National Scenic Spot
Situation1 ______Zhanjiang
Consist 2 ______and the basalt rock-groups
The area of the spot 3 ______square kilometers
The area of the lake4 ______square kilometers
Form about 5 ______years ago