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Jobisdone [24]
3 years ago
9

True or false Folded rocks were produced by isostasy.

Biology
1 answer:
liraira [26]3 years ago
5 0
I believe that its False, but don't hold me to that
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The half-life of protactinium-226 is 2 minutes if you started with 20 grams of pa-226 how much do you have after 8 minutes
Hunter-Best [27]

Divide the amount in half for every 2 minutes

0 minutes = 20 grams

2 minutes = 20/2 = 10

4 minutes = 10/2 = 5

6 minutes = 5/2 = 2.5

8  minutes = 2.5/2 = 1.25 grams

4 0
3 years ago
Which words or phrases describe characteristics of quartzite? Check all that apply.
Strike441 [17]

Answer:

hey you!

Explanation:

Quartzite

Quartzite is a metamorphic rock formed when quartz-rich sandstone or chert has been exposed to high temperatures and pressures. Such conditions fuse the quartz grains together forming a dense, hard, equigranular rock. The name quartzite implies not only a high degree of induration (hardness), but also a high quartz content. Quartzite generally comprises greater than 90% percent quartz, and some examples, containing up to 99% quartz, and are the largest and purest concentrations of silica in the Earth's crust. Although a quartz-rich sandstone can look similar to quartzite, a fresh broken surface of quartzite will show breakage across quartz grains, whereas the sandstone will break around quartz grains. Quartzite also tends to have a sugary appearance and glassy lustre. The variety of colours displayed by quartzite are a consequence of minor amounts of impurities being incorporated with the quartz during metamorphism. Although quartzite can sometimes appear superficially similar to marble, a piece of quartzite will not be able to be scratched by a metal blade, and quartzite will not fizz on contact with dilute hydrochloric acid.

Texture - granular.  

Grain size - medium grained; can see interlocking quartz crystals with the naked eye.  

Hardness - hard.  

Colour - variable - pure quartzite is white but quartzite exists in a wide variety of colours.  

Mineralogy - quartz.  

Other features - generally gritty to touch.  

Uses - pure quartzite is a source of silica for metallurgical purposes, and for the manufacture of brick; as aggregate in the construction and roading industries; as armour rock for sea walls; dimension stone for building facings, paving etc.  

New Zealand occurrences - northwest Nelson (Aorere).

8 0
3 years ago
Read 2 more answers
What theory do scientists have for the formation of desert pavement ?
V125BC [204]

Answer:Several theories have been proposed for the formation of desert pavements. A common theory suggests they form through the gradual removal of sand, dust and other fine-grained material by the wind and intermittent rain, leaving the larger fragments behind.

Explanation: scientists have had sever theories as stated in my answer above

7 0
3 years ago
When rocks form in a discontinuous fashion, they are formed suddenly and their minerals change
Lubov Fominskaja [6]
False. they form slowly due to erosion and the minerals stay the same
8 0
2 years ago
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For each food listed below, choose whether it has all single carbon-to-carbon bonds or at least one double carbon-to-carbon bond
konstantin123 [22]
All of the food have Carbon in them bc everything have carbon in it even humans
4 0
3 years ago
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