on April 16, 2022
Which mineral will not scratch quartz?
GeologyDiamond is the hardest mineral; no other mineral can scratch a diamond. Quartz is a 7.…Mohs Hardness Scale. Hardness Mineral 10 Diamond Can you scratch quartz crystal? Quartz is harder than any of the common minerals in meteorites. Quartz is so hard that it will easily make a deep scratch in glass. Even if you
on April 16, 2022
What is in glacial rock dust?
GeologyThis mixed pile of rocks is where glacial rock dust comes from. Made of a wide variety of rocks, it contains a complex blend of minerals. It is particularly good for adding calcium, iron, magnesium, and potassium. It also contains some manganese, cobalt, silicon, and small amounts of other minerals as well.Nov 14, 2018 Is
on April 16, 2022
What would decrease the competence of a stream?
GeologyWhat affects stream competence? Stream capacity is the maximum amount of solid load (bed and suspended) a stream can carry. It depends on both the discharge and the velocity (since velocity affects the competence and therefore the range of particle sizes that may be transported). What decreases stream competence? Vegetation has a known impact on
on April 16, 2022
How can ocean basins change in size?
GeologyThe major factor behind the variations is plate movements and related changes in climate and ocean water circulation. Since about 200 million years ago, a single vast ocean basin has given way to five or six smaller ones. The Pacific Ocean basin has shrunk, while the North and South Atlantic basins have been created. How
on April 16, 2022
What volcanoes are active in the US?
GeologyAre there any active volcanoes in the US? “There are about 169 volcanoes in the United States that scientists consider active. Most of these are located in Alaska, where eruptions occur virtually every year. Others are located throughout the west and in Hawaii (see our Volcano Activity Map for their locations). What are the 3
on April 16, 2022
Did Arizona just have an earthquake?
GeologyWhen was the last time Arizona had an earthquake? Most recent felt events, include: 2005 M5. 2 near Holbrook; 2014 M5. 3 near Duncan; 2015 M4. 1 near Black Canyon City, AZ. Was there an earthquake just now near Tucson AZ? There were no significant confirmed earthquakes in or near Tucson in the past 24
on April 16, 2022
How do you survive a lahar?
GeologyHow can I survive a lahar? Quote from video:Listen for a roar. If you hear lahar roaring toward you immediately. Head for higher ground avoid canyons as landslides. How do people adapt to lahar? Strategies include (1) hazard avoidance with land-use planning and zonation; (2) hazard modification with engineered protection structures (bypass channel and deflection
on April 16, 2022
What does chalcedony look like?
GeologyChalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black. What does chalcedony rock look like? Chalcedony occurs in a wide range of colors. It
on April 16, 2022
What is glass that won’t melt?
GeologyBorosilicate glass is a type of glass that contains boron trioxide which allows for a very low coefficient of thermal expansion. This means it will not crack under extreme temperature changes like regular glass. What is the most heat-resistant glass? Aluminosilicate glass is highly resistant to most chemicals. Fused Quartz and High Silica glass provide
on April 16, 2022
How do rocks help soil?
GeologyStones in soil help it drain well. They protect it from erosion and evaporation of moisture. They cool the soil’s surface on a hot day, but upon absorbing some of the sun’s heat, help warm the soil at night — a fact especially important to a gardener wary of frost in spring or fall. Why