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Thursday, July 20, 2017

Logan Pass on Continental Divide - Glacier Park, Montana

Logan Pass (elevation 6,646 feet) on the Continental Divide is the highest point on the Going-to-the-Sun Road in Glacier National Park. Although there are higher areas in the south-central part of the state, Logan Pass gets more precipitation than any place in Montana. Mountains along the divide force moist air from the Pacific upward, causing cooling by expansion. As the air reaches its dew point, vapor changes to snow (or rain). Also, Arctic air often moves into Montana along the east side of the divide, contributing to the lifting and cooling of Pacific air from the west. An area just east of Logan Pass, called “The Big Drift”, often records over 80 feet of snow, much of it pushed there by strong westerly winds that blow in the winter. A record gust of 139 mph was recorded in April of 2014.

The Going to the Sun Road, which can be seen in the photo, is one of the most scenic drives in the USA, and also one of the most difficult to snowplow. Crews usually begin plowing in early April, and the road is usually open from early June to mid-October, with the latest opening date being July 13, 2011 due to tremendous amounts of snow that fell that winter. The road, which was completed in 1932 and opened in 1933, connects the east entrance of the park (St. Mary) with the west entrance (near Lake McDonald). Although there aren’t many glaciers left in the park, the road provides visitors with excellent views of features carved by glaciers, including, hanging valleys, horns, glacial troughs, arĂȘtes, and cirques. For those who want a closer look, there are several hiking trailheads along the highway, including the spectacular "Highline Trail" that starts at Logan Pass. The trail passes above the highway and below a portion of the Continental Divide known as “The Garden Wall.” The Highline Trail can be seen on the left side of the photo - between the highway and the patches of snow.

More information

1. Peak Bagging Near Logan Pass (many more photos)

2. Hiking the Highline - best trail in the park

3. Montana Precipitation Map

4. Wikipedia: Going to the Sun Road

Tuesday, June 6, 2017

GREAT eclipse site from NASA - Must see!

Thanks to Rick Dees for sending this one my way. The total eclipse of the Sun will happen on Monday, August 21 this summer. Make plans now!

CLICK HERE to find out what it will look like from various locations. You can zoom, tilt the globe, or select a new location. THIS IS GREAT! It shows what it will look like from your location, including the timing. *See credits below.

Map courtesy of www.greatamericaneclipse.com/nation/.

*Credits
Producer: Kevin Hussey

Ranger Task Manager: Marc Pomerantz

Software Engineering Team Lead: Andrew Boettcher

JPL Ranger Software Engineering team: Andrew Boettcher, Michael Hans, Anton Kulikov, Mi Nguyen, Marc Pomerantz, Michael Sandoval, Davit Stepanyan, Brian Wright

Additional JPL support: Jason Craig, Matthew Garcia, Kevin Hussey, Daniel Sedlacko

UI Design and Development: Moore Boeck

Copyright 2017, by the California Institute of Technology. ALL RIGHTS RESERVED. United States Government Sponsorship acknowledged. Any commercial use must be negotiated with the Office of Technology Transfer at the California Institute of Technology.

Friday, June 2, 2017

Montana Lake Carved by Outburst Floods During Ice Age

Lots of geology going on here. Two of my hiking buddies are standing on the remains of a laccolith looking at Lost Lake whose basin was carved by outburst floods during the last ice age. The mountains in the background (Highwoods) are the remains of an ancient volcano that was active 50 mya.

After visiting Lost Lake we hiked up onto Square Butte (another laccolith). Both features are made of rock formed as magma cooled beneath the surface tens of millions of years ago. However, the story of Lost Lake includes another chapter that involved an unusual set of circumstances that happened during the last ice age. To learn how outburst flooding of Glacial Lake Great Falls was involved, go to bigskywalker.com.

Friday, May 19, 2017

GREAT 13-minute segment about Mars from "60 Minutes"

In case you missed it, this is a GREAT segment that includes several important Earth Science concepts - Earth's magnetic field, plate tectonics, law of superposition, erosion, meteorites, etc. Consider showing it as you teach about the rock cycle. Here are some possible questions to guide a discussion after showing it.

1. Is there a "rock cycle" on Mars?
2. How is it different from the rock cycle on Earth? What processes are missing?
3. Is there molten rock on Mars?
4. Are there metamorphic rocks on Mars?
5. What drives the rock cycle on Earth?

Sunday, May 14, 2017

Convection - The straw that stirs the drink.

Whether you're talking atmosphere, oceans, or mantle, one of the most important processes in Earth systems is convection. Here is one of our favorite activities for our freshmen Earth Science students at Helena High. The lab, which has two parts, allows students to see convection as it happens. The part shown in the video below focuses on helping students understand the role convection plays in causing wind. The box of water represents air.

The lab comes in a kit we purchase from WARD'S Natural Science, which includes this 2-part activity plus another activity related to ocean currents. The kit is called "Exploring Convection." To make the blue ice cubes, add 3 drops of food coloring to each empty cube mold in an ice cube tray, add water, and freeze.

CLICK HERE to see a video of "Part I".

CLICK HERE to see a video of the other lab included in the kit (related to ocean currents).

Friday, April 21, 2017

How the USA Generates Electricity

Check out this interesting Washington Post site, which includes several informative graphics. Every student should have some sense of where electricity comes from? Once the site opens, be sure to scroll down and select the different types of energy to see how each state generates electricity - Just below where it says, "Click to rearrange."

Friday, March 31, 2017

Glacial Striations on Snake Butte


Click on the image to see a larger view.

This photo, taken on Snake Butte in north-central Montana, shows scratches that were made as the Laurentide Ice Sheet (continental glacier) flowed across here during the last ice age. Rocks that were stuck to the bottom of the ice caused the gouges - called "striations." Snake Butte is about 10 miles south of Harlem, MT on the Ft. Belknap Indian Reservation. The Little Rockies can be seen in the distance.

Striations help determine which direction the glacier flowed as it grew across the land, and also help locate "spreading centers" where the ice grew FROM, before merging to form the single continental glacier that covered Canada. Striations found in various parts of Canada reveal that there were three places in northern Canada where snowfall accumulations contributed to the ice sheet that eventually reached the USA (Of course there was no USA at that time!). These striations on Snake Butte prove the glacier flowed toward the southeast as it moved over the butte - probably because the Bears Paw Mountains (several miles southwest of here) forced the ice in that direction.

Below: The black dashed line indicates how far south the ice advanced into Montana when the ice age peaked about 18,000 years ago.

In addition to striations, the Laurentide Ice Sheet left other clues in the Snake Butte area.

1. Erratics – Metamorphic rocks from the Hudson Bay area can be found on Snake Butte (and throughout northern Montana). These rocks, which were embedded in the ice, were dropped here when the ice melted.

2. The Snake Butte Boulder Train – Large pieces of Snake Butte (igneous rock) have been scattered in a straight line extending to the southeast of Snake Butte. As the glacier flowed across the butte, pieces of the butte were carried away, and eventually dropped as the ice melted. Although they are few and far between, the line extends for almost 50 miles. The direction of the boulder train matches the direction indicated by the striations.

For much more about Snake Butte, CLICK HERE (link does not open on many mobile devices).