on April 15, 2022
When was the last big earthquake in Oregon?
Regional Specifics#1: Magnitude 6.2 on August 22, 2018. Even the strongest Oregon quake in the last decade wasn’t strong enough to trigger tsunami warnings. It shook the earth and water at 1:30 a.m., about 170 miles west of Coos Bay. People in Portland reported feeling the quake. What was the worst earthquake in Oregon? The first
on April 15, 2022
How does carbon dioxide kill trees and wildlife?
Regional SpecificsAlthough leaves of plants produce oxygen (O2) from CO2 during photosynthesis, their roots need to absorb O2 directly. High CO2 concentrations in the soil kill plants by denying their roots O2 and by interfering with nutrient uptake. What was killing the trees around Horseshoe Lake on Mammoth Mountain CA? carbon dioxide (CO2) A soil-gas survey
on April 15, 2022
When did the continental drift happen?
Regional SpecificsPangaea existed about 240 million years ago. By about 200 million years ago, this supercontinent began breaking up. Over millions of years, Pangaea separated into pieces that moved away from one another. These pieces slowly assumed their positions as the continent we recognize today. How did the continental drift happen? Continental drift over millions of
on April 15, 2022
How does the thickness of Earth’s oceanic crust compared to the thickness of the continental crust?
Regional SpecificsContinental crust is typically 40 km (25 miles) thick, while oceanic crust is much thinner, averaging about 6 km (4 miles) in thickness. The effect of the different densities of lithospheric rock can be seen in the different average elevations of continental and oceanic crust. Why thickness of continental crust is more than oceanic crust?
on April 15, 2022
What is glacial abrasion?
Regional SpecificsGlacial abrasion is the wear of a bedrock surface by rock fragments transported at the glacier base. Glacial abrasion is the process of erosion caused by the movement of a glacier or ice sheet over underlying surfaces. This process results in the formation of striations or grooves, as well as the abrasion of rocks and
on April 15, 2022
Is Kostal Cone active?
Regional SpecificsWith an elevation of 1,440 m (4,724 ft), Kostal Cone is one of the lowest volcanoes in the Wells Gray-Clearwater volcanic field. There has been activity at this site as recently as 7,600 years ago, though more likely less than 1,000 years ago. Is the dragon cone volcano active? Dragon Cone is a monogenetic cinder