GEOSCI 100 Lecture Notes - Lecture 26: Radioactive Decay, Aquifer, Ultraviolet
9 May 2018
School
Department
Course
Professor
5/1/18
Hydrologic Cycle continued & Earthquakes
Free Exam Questions:
1. About how much of Earth’s water is freshwater?
A. 0.2%
B. 4%
C. 9%
D. 25%
2. What powers the Earth’s climate system?
A. Magnetism
B. Tidal friction
C. Radioactive decay in Earth’s interior
D. Solar energy
6. Solar radiation absorbed by the Earth's ground surface is reemitted as __________.
A. Infrared radiation
B. Visible radiation
C. Ultraviolet radiation
D. X-ray radiation
7. T/F: Current surface temperatures are the highest they have been in Earth’s history.
A. True
B. False
*Groundwater - water held underground in the soil or in pores and crevices in rock
*Groundwater Table - unsaturated on top,
saturated on the bottom
Lecture Slideshow Slides #35 & 36
Document Summary
*groundwater - water held underground in the soil or in pores and crevices in rock. *groundwater table - unsaturated on top, saturated on the bottom. *aquifer - rock bed that stores and transmits groundwater in sufficient quantity to supply water wells. *aquiclude (aquitard) - a relatively impermeable rock bed that acts as a barrier to groundwater flow. Confined - has an aquiclude above it; impermeable dirt/rock layer exists that prevents water from seeping into the aquifer from the ground surface located directly above. Unconfined - no barrier, no aquiclude above it. Water seeps from the ground surface directly above the aquifer. Residential use - of wisconsin"s residents draw nearly 200 million gallons of groundwater daily at home to slake thirsts, scrub pots, boil spaghetti, rinse hair, soak socks and fill balloons. That"s 63 gallons per person per day. We have good aquifers because of our old sandstone.
