These are two causes for variation in the intensity of the sun's energy felt by earth
What are strengthening of the sun and orbital variations
100
This elongated, streamlined hill oriented parallel to ice flow direction is made of glacial sediment and forms underneath moving ice.
What is a drumlin?
100
Well-sorted, cross-bedded sandstones form here
What is a beach or desert?
100
A coarse grained, banded, crystalline rock
What is gneiss
200
This orogenic event resulted in the collision of a volcanic island arc with the coast of Laurentia
What is the Taconic Orogeny?
200
Much of what we know about the climate in the past 65 My or so comes from this isotope.
What is oxygen-18?
200
The altitude on a glacier above which there is net accumulation and below which there is net ablation of ice and snow.
What is the equilibrium line altitude?
200
This kind of rock forms in terrestrial environments like alluvial fans, flanks of mountains, and river channels
What is conglomerate?
200
A texture characterized by grains held together with cement
What is clastic?
300
These rocks were deposited, then metamorphosed during two different orogenic events.
What is the Worcester Formation (or, "Rocks at Cookson Park")
300
This process concentrates oxygen-18 in the oceans as ice builds up on land
What is fractionation?
300
This bowl-shaped feature scooped out of a mountain by glacial erosion is the awesomest glacial landform.
What is a cirque?
300
Limestones typically form in these two environments
What is reef and deep ocean
300
This kind of rock makes up the islands of Hawaii
What is basalt?
400
The type of tectonic boundary here at 180 My ago
What is divergent?
400
This geologic phenomenon is responsible for changing ocean and atmospheric currents on long timescales
What is plate tectonics?
400
These two factors control the rate of internal deformation in glacial ice
What are temperature and slope of the ice surface?
400
These two common minerals form from the evaporation of seawater
What are halite and gypsum?
400
You would use this feature to distinguish between a marble and a quartzite
What is effervescence with HCl or hardness
500
Daily Double: In the next 5 minutes, sketch a series of 2-3 "cartoons" showing the continental motions and plate boundaries associated with the Alleghanian Orogeny
See sketches
500
Daily Double: In the next 5 minutes, draw a flowchart showing the relationships and feedbacks between global temperature, CO2 in the atmosphere, chemical weathering, and carbonate rock formation
See answers
500
This mix of very poorly sorted sediment is deposited directly by glacial ice
What is till?
500
You would expect to find this (or these) minerals in a sandstone derived from granite
What is quartz (and possibly feldspar)?
500
Fine-grained crystals of plagioclase, pyroxene and amphibole form the bulk of this intermediate volcanic rock