Igneous Rock

Obsidian


Obsidian is made by the lava that comes from a volcano that rapidly cools into a glass looking igneous rock that lacks any crystal growth. Obsidian is translucent and is black. On the Mohs scale of hardness it is a 5-6.  The luster it gives off is vitreous. Back in the day this rock was used for arrowheads or sharp weapons because it could be fractured into sharp objects easily and it was durable. It also was used for early mirrors.

Minerals on our Earth

Quartz

Hornblende

Feldspar

Limestone

Galena

Mica

Lab 2 Maps

Isarithmic Temperature Map 

Dot Density Map

Proportional Symbol Map

Choropleth Map

Uluru

Uluru is a an island mountain located in the Northern Territory in central Australia. This spectacle is in the Uluru-Kata Tjuta National Park. Uluru, also known as Ayers Rock, is 2,831 feet tall and 5.8 miles around. The reason it stands so prominent in the middle of no where is because it is the remnants of a larger mountain range that has eroded over time. It can actually be called a monolith, a single massive stone or rock structure.  There are many natural wonders like waterholes and rock caves that surround this mountain. That is probably why the ancient Aboriginal people would worship the mountain and create ancient paintings that are masterpieces on their own. The mountain can be seen to have multiple colors because during different times of the day and year, Uluru can turn bright red or into a darker brown. The composition of Uluru is mainly a type of sandstone with an abundance of feldspar, or coarse-grained arkose.