her is this from google
"A system of temporary reference points established in the field allows users to move freely within the study area without losing the geo-referencing. It allows the user to perform the mapping of trees, deadwood, transects, repeated measurements and data verification."
Answer:
d. lava flows volcanic mudslides called lahars
Explanation:
Mudflows of volcanic eruptions are the most dangerous, and are called lahars. A lahar is a type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris, and water.
The 60th parallel north is a circle of latitude that is 60 degrees north of Earth's equator.
