Share this page!

Enter URL or ID to Unroll

You can paste full URL like: https://x.com/threadreaderapp/status/1644127596119195649
or just the ID like: 1644127596119195649

How to get URL link on X (Twitter) App

  1. On the Twitter thread, click on or icon on the bottom
  2. Click again on or Share Via icon
  3. Click on Copy Link to Tweet
  4. Paste it above and click "Unroll Thread"!
  5. More info at Twitter Help
Mining Association of Nova Scotia Profile picture
@MiningNS
Jul 23, 2020 • 10 tweets • 13 min read • Read on X
Scrolly
It's a wee bit cooler today but nothing like 126,000 years ago when the #AtlanticBubble was covered in ice!
The last ice age ended 10,000 years ago but there have been glacial periods in #NovaScotia on and off for at least 500,000 years...
#nspoli #cbpoli #capebreton @NS_Museum Image
During periods of climatic cooling, ice sheets develop and advance, aided by the reflection of the sun's light from the white snow surface. Sea levels drop as ocean water is used to make ice. The glaciers grow, coalesce and flow all the way out to...
#nspoli #cbpoli #Novascotia Image
...the edge of the continental shelf. There, melting and ice sheet disintegration begin as glaciers become buoyant in deep water. This starts the retreat process, which is accentuated as the sea-level rises, and helps to further destabilize the ice sheets.
#nspoli #cbpoli Image
Finally, the rising sea and global warming win out and the glaciers are in full retreat. Land, depressed by the weight of the kilometre-thick glaciers, is driven upwards as the earth rebounds.
Glaciers shaped #NovaScotia as we know it today. For example:
#nspoli #cbpoli Image
Most lakes in #NovaScotia, like #LakeBanook and #BrasdOrLake, were made by glaciers carving depressions in bedrock that filled with water as glaciers melted.
#nspoli #cbpoli #capebreton ImageImage
Glaciers created landmarks like #CitadelHill and George’s Island, which are drumlins - rocks, gravel, sand and clay left by glaciers as they receded. Even famous, mysterious #OakIsland is a drumlin!
#nspoli #cbpoli #capebreton #novascotia @HalifaxCitadel Image
#SableIsland is the top of a huge sand bank (a "moraine") left by melting glaciers 18,000 years ago when sea levels were 100 metres lower than now. As sea levels rose, it became an island.
#nspoli #cbpoli #capebreton #novascotia Image
The #AnnapolisValley was carved by glaciers because its soft sandstone was easily eroded. South Mountain and North Mountain resisted erosion because they are made of harder rock – South Mountain is granite and North Mountain is sandstone covered by basalt, which is very hard. Image
The sand, soil and clay at #CapeBreton’s #CabotsLanding are glacial outwash - sediments deposited by glaciers as they melted. Much of the sediment is eroded from the #CBHighlands, which used to be much bigger - the Highlands are a remnant of...
#nspoli #cbpoli #novascotia Image
...the Appalachian Mountain chain which formed 480 million years ago when North America and North Africa started colliding.
#nspoli #cbpoli #capebreton #novascotia Image

• • •

Missing some Tweet in this thread? You can try to force a refresh
　

Keep Current with Mining Association of Nova Scotia

Mining Association of Nova Scotia Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @MiningNS

Mining Association of Nova Scotia Profile picture
Feb 25, 2021
@nsgov announced new rebates for electric vehicles yesterday. Mining makes #greentech like electric cars possible because they are mostly made of minerals and metals.
#nspoli @KeithIrvingNS @IainTRankin @NS_Energy_Mines @ns_environment @ChenderMLA @AllanMacMaster @MLAChuckPorter Image
For example, an e-car has 183 pounds of copper wiring in it because copper is used in every major component from the motor to the inverter and the electrical wiring. There is about four times more copper in an e-car than in a car with an internal combustion engine.
There are about 400 electric cars on Nova Scotia roads - a total of over 73,000 pounds of copper!
An electric car uses 25-50 grams of silver, so Nova Scotia’s 400 e-cars contain about 15,000 grams of it.
Read 9 tweets
Mining Association of Nova Scotia Profile picture
Sep 23, 2020
The Morris Street Engine House has been declared a municipal heritage property!
#Halifax’s Fire Station #2, as it is also called, was built 1907-08 of reinforced concrete.
Here's the story!
#nspoli @HFXFireHistory @HRMFireNews @hfxfire @HFXFirefighters @hfxgov @MikeSavageHFX
Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. (The terms cement and concrete are often used interchangeably, but cement is actually an ingredient of concrete...
#nspoli
...Cement is the glue that holds concrete together.)
Reinforced concrete means the concrete is poured over a frame, usually steel bars, that give the structure greater strength.
#nspoli
Read 12 tweets
Mining Association of Nova Scotia Profile picture
Sep 21, 2020
We love getting questions about mining, minerals and geology! We were asked about sinkholes and whether they are a risk when walking in the woods.
#nspoli #cbpoli #novascotia #capebreton @oxfordsinkhole ImageImage
The short answer is yes, sinkholes are real but no, they are not a major risk and should not prevent you from enjoying outdoor activities.
Most natural sinkholes are caused by groundwater naturally eroding rocks like gypsum, salt and limestone which are water-soluble.
#nspoli Image
The water erodes the rock, leaving an underground cavern. Eventually, the weight of the rock and earth above the cavern causes the sinkhole to form. Sinkholes can form either gradually (i.e. a small depression appears and perhaps grows larger over time) or by sudden collapse. Image
Read 18 tweets
Mining Association of Nova Scotia Profile picture
Sep 20, 2020
We love getting questions about mining, minerals and geology! We were asked about the historic #NewCampbellton coal mine in #VictoriaCounty.
#nspoli #cbpoli #novascotia #capebreton #nshistory
@JaimeBattiste ImageImage
The New Campbellton coal mine was opened in 1862 by Charles J. Campbell, a former Member of Parliament, Member of the Legislative Assembly and executive council member. The community had been named Kelly’s Cove but was changed to New Campbellton in 1862 in honour of Mr. Campbell. Image
A sample of New Campbellton’s coal was sent to the 1865 Dublin Exhibition and “was very favorably noticed by the Judges,” according to a report.
#nspoli #cbpoli #novascotia #capebreton #nshistory Image
Read 18 tweets
Mining Association of Nova Scotia Profile picture
Sep 19, 2020
Mining built #NovaScotia!
#Halifax was founded in 1749 and its first court house is reported to have been built by 1754 on the northeastern corner of Buckingham + Argyle streets. After the building burned in 1789, the courts were temporarily housed in various buildings.
#nspoli ImageImage
In April 1851 a bill to provide Halifax with a county court house was passed. Mr. H.G. Hill, a prominent #Halifax architect, prepared a plan for a wooden building.
However, since the records of the county, wills, deeds and other papers of public office were...
#nspoli #novascotia Image
...to be stored in the court house, it was important that the building be fire-proof. Also, a number of serious fires in #Halifax in 1857 led to the passage of a bylaw that required large buildings be made of stone or brick, so Hill's plans for a wooden building were abandoned. Image
Read 10 tweets
Mining Association of Nova Scotia Profile picture
Sep 18, 2020
The Sullivan Creek #coal mine, before and after!
It's one of several mines reclaimed around #AlderPoint #CapeBreton in the late 1900s/early 2000s - examples of how mining makes temporary use of land and then land can be used other ways.
#nspoli #cbpoli #novascotia @JaimeBattiste ImageImage
The first mine in the area was the Scotia Mine, or #NovaScotia Steel & Coal Company No. 4 Colliery, on Toronto Road, which operated on the Sydney Main (Harbour) Seam from 1915 to 1921.
#nspoli #cbpoli #novascotia @JaimeBattiste ImageImage
Coal quality and structural issues (including water inflow) plague the Harbour Seam west of Florence so upon closure of the colliery, production on the Harbour Seam was limited to the Company’s No. 3 Colliery in Florence, which had opened in 1902...
#nspoli #cbpoli #novascotia ImageImage
Read 19 tweets

Did Thread Reader help you today?

Support us! We are indie developers!

This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us!

Send Email!

:(