Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Hekla:

"

By 5:30 on 6 May, the lava flow measured 4 km (2.5 mi) long. Many lava bombs were found near the main crater, one had an area of 6 m2 (65 sq ft) and a likely weight of 12 tons.[citation needed] Xenoliths formed around 2% of the material produced by the craters. These were of rock types including basalt, andesite, ignimbrite and sedimentary rock.