Zircon (ZrSiO4) forms in magma as it cools into igneous rock. It is also useful for numerical dating.

a. If you walk on a modern New Jersey beach, then you will walk on some zircon sand grains. Yet if you determine the numerical age of the zircons, it does not indicate a modern age (zero years) for the beach. Why?
b. Suggest a rule that geologists should follow when they date rocks based on the radiometric ages of crystals inside the rocks.

Answers

Answer 1

Answer:

Zircon is essential element in the formation of igneous ricks.

Explanation:

Zircon crystal commonly grow in rocks and are very small in size. Zircon forms magma ad the lavas as it cools and thus is useful for absolute dating but does not indicate modern age for the beach. Due to the structure of the crystal, as it solidifies in magma. Once make sure that the crystal formed inside the ricks are formed at the same time as the rock itself. As the ricks are formed in different environments just beneath the surface of the earth.

Related Questions

write a note on alternative energy resourse

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Answer:

Alternative Energy refers to energy sources other than fossil fuels. This includes all renewable sources and nuclear. Nuclear is not classified as a renewable energy source. A renewable energy source is produced from sources that do not deplete or can be replenished within a human’s lifetime. Nuclear is produced from mined elements like uranium and thorium which cannot be replenished.

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a rick existing perceived is termed as a _________

Answers

Answer:

có mà

Explanation:

A field of corn being harvested by huge machines represents

A)commercial farming.
B)nonrenewable resource management.
C)commercial Industry.
D)subsistence farming

Answers

Answer:

A. Commerical Farming

Explanation:

define commercial geograpghy as industralist

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industrialist. A: IMPORTANCE OF COMMMERCIAL GEOGRAPHY FOR AN. INDUSTRIALIST:Commercial geography refers to the location where the. different branches of trade and commerce are located. Today if one wants.

Answer:

industrialist. A: IMPORTANCE OF COMMMERCIAL GEOGRAPHY FOR AN. INDUSTRIALIST:Commercial geography refers to the location where the. different branches of trade and commerce are located.

Explanation:

Regional Geography lays emphasis on the distinctiveness of a particular place an the characteristics or activities that make up the that location. With specific examples from Ghana and knowledge acquired im the regional Geography of Ghana course so far, discuss the above sentence

Answers

Answer:

Place has a prime importance in distribution of economic activates.

Explanation:

Regional geography is a part of geography that studies various regions and studies the specific unique characters of the place. It is related to the topography and economy of the place. A place such as Ghana is located on the African western coast. Located in the gulf of guinea this country lies near the equator and thus has a warm climate. Due to its location, the prime meridian passes through the country. Ghana is rich in natural resources and has a mixed economy with rapid population growth. Petroleum accounts for a large share of exports.

What is the relevance of Von Thunen model of agricultural land use

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Answer:

The Von Thunen model of agricultural land use was created by farmer and amateur economist J.H. ... Farmers in the Isolated State transport their own goods to market via oxcart, across land, directly to the central city. Therefore, there are no roads. Farmers act to maximize profits.

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How climate change affects the degradation of biodiversities in the world

Answers

Healthy ecosystems and rich biodiversity are fundamental to life on our planet. Climate change is affecting the habitats of several species, which must either adapt or migrate to areas with more favourable conditions. Even small changes in average temperatures can have a significant effect upon ecosystems.

climate change affects biodiversity. Although throughout Earth's history the climate has always changed with ecosystems and species coming and going, rapid climate change affects ecosystems and species to adapt and so biodiversity loss increases.....

Which of the following statements is true about the production of goods and services in a capitalist economy?

A)Elected leaders make all decisions

B)Individuals or companies make most decisions

C)Government planners make most decisions.

D)Government planners make all decisions,

Answers

Answer:

B. Individuals Or Companies Make Most Decisions

Explanation:

Answer: B

Explanation: Got it right on my test.

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Landslide - Vajont Dam Slide, Italy. These placemarks fly you to the site of the Vajont Dam disaster that occurred in Italy in 1963. Which answer correctly identifies the features highlighted by the Problem 10a, 10b, and 10c placemarks?
a. Problem 10a: dam; Problem 10b: hummocky debris apron; and Problem 10c: slide scar
b. Problem 10a: hummocky debris apron; Problem 10b: slide scar; and Problem 10c: dam
c. Problem 10a: slide scar; Problem 10b: dam; and Problem 10c: hummocky debris apron

Answers

Answer:

a. Problem 10a: dam 10b: hummocky debris apron; and Problem 10c: slide scar

Explanation:

The Dam is located in north Italy. It is located in the valley of the Vajont river. There were some problems associated with the dam and reservoir as the canyon was steep and had undercut the banks of the river.

silicon and _______ stay in the the outer cells pls tell me fast

Answers

Answer:

Oxygen

Explanation:

The earth has been divided into three major categories crust, mantle, and core which are further segregated into sub-parts. Since the crust is the outermost layer of the shell, the outer crust of the earth consists of a combination of silicon and oxygen in the majority followed by some percentage of other metals as well. The percentage of Oxygen includes nearly 50% i.e. 46.6% followed by 27.7% of Silicon and the other 25.3 % includes aluminum, iron, sodium, magnesium, etc. Thus, 'oxygen' is the correct answer.

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