- What causes white lines in rocks?
- How are rock patterns formed?
- Will all rocks always complete one rock cycle?
- How do I identify my rocks?
- Is chalk a soft rock?
- What kind of rocks have stripes?
- What do lines on rocks mean?
- What does a wishing rock look like?
- How can a rock be changed but still be classified as the same rock?
- Which layer of rock is the oldest?
- What is a very soft rock?
What causes white lines in rocks?
Often those white bands or stripes, called veins, are quartz or calcite.
The quartz filled the fissures or cracks in rocks.
Others are formed from sedimentary rocks (those with layers of minerals) that were folded and thrusted, allowing those horizontal layers to become curving lines..
How are rock patterns formed?
Sedimentary rocks are formed through the gradual accumulation of sediments: for example, sand on a beach or mud on a river bed. … Metamorphic rocks are rocks which once existed as igneous or sedimentary rocks but have been subjected to varying degrees of pressure and heat within the Earth’s crust.
Will all rocks always complete one rock cycle?
Does every rock go through the complete rock cycle, from igneous rock or sedimentary rock to metamorphic rock and back to igneous rock, each time around? … No; rocks can change from any rock type to either of the other types in the rock cycle. Give one example each of igneous, sedimentary, and metamorphic rocks.
How do I identify my rocks?
Can you identify my rock or mineral?Your state geological survey.A natural science museum.A college or university with a geology department.A rockshop.Members of a local Gem & Mineral club or Rockhunting club (many hobbyists are experts at identification)Vendors at a Gem & Mineral show.
Is chalk a soft rock?
Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of sub-microscopic plankton which had fallen to the sea floor.
What kind of rocks have stripes?
Some of the sedimentary rocks are held together by an electrical attraction, while others remain loose and brittle. This type of rock can be characterized by distinct layers of rock that run parallel to each other and can even look like stripes.
What do lines on rocks mean?
Striped patterns in stones are usually caused by layers of sediment that have accumulated over time. … When a layered rock is quarried and sawn into blocks, its layers look like stripes. They can be subtle or vivid; straight, wavy, or chaotic.
What does a wishing rock look like?
It’s a rock with a single perfectly unbroken stripe all the way around the circumference of the rock. … Aside from the “single line” requirement, wishing rocks have no “rules” associated with them. They can be little or large, any color, any shape. Like heart stones, wishing rocks also make a lovely gift.
How can a rock be changed but still be classified as the same rock?
Answer: When any rock undergoes the process of weathering, sedimentation, crystallization and metamorphism, the rock changes but still can be classified as the same form of rock respectively. Explanation: … The process of weathering and erosion of the sediments and the existing rocks forms sedimentary rocks.
Which layer of rock is the oldest?
bottom layerThe bottom layer of rock forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all. This ordering is relative because you cannot be sure exactly when each layer formed, only that each layer is younger then the one below it.
What is a very soft rock?
What is Soapstone? Soapstone is a metamorphic rock that is composed primarily of talc, with varying amounts of chlorite, pyroxenes, micas, amphiboles, carbonates, and other minerals.  Because it is composed primarily of talc it is usually very soft.