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Chapter 17: Problem 15

Why are most meteorites found in Antarctica?

Short Answer

Expert verified
Most meteorites are found in Antarctica because the ice and snow make them easier to spot, and the ice flow concentrates them in certain areas.

Step by step solution

01

- Understand Meteorite Origins

Meteorites are fragments of rock and metal from space that survive their passage through the Earth's atmosphere and land on the Earth's surface.
02

- Analyze Meteorite Visibility

In most parts of the world, meteorites can be difficult to spot because they blend in with the existing landscape. However, in Antarctica, the contrast between the dark meteorites and the white ice makes them easier to identify.
03

- Consider the Ice Flow

In Antarctica, ice flows can concentrate meteorites in certain areas, making them easier to find. As the ice moves, it carries meteorites towards certain locations, such as the base of glaciers, where they accumulate.
04

- Factor in the Remote Environment

Antarctica is relatively undisturbed by human activity, so meteorites that land there are less likely to be found and removed by people, allowing them to accumulate over time.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

meteorite origins
Meteorites are fascinating celestial rocks that have traveled through space for millions or even billions of years. They originate from various sources, such as asteroids, comets, and even the moon or Mars. When these fragments enter Earth's atmosphere, they experience intense friction and heat, causing them to burn and sometimes break into smaller pieces. However, some survive this fiery journey and land on Earth's surface. The study of meteorites helps scientists understand the early solar system and the processes that shaped our planetary neighbors.
visibility in Antarctica
One of the primary reasons why Antarctica is a hotspot for meteorite discoveries is due to its unique landscape. In most regions, meteorites blend into the surrounding environment, making them hard to spot. However, in Antarctica, the stark contrast between the dark-colored meteorites and the bright, white ice and snow makes them much easier to find. This visibility advantage helps researchers identify and collect meteorites more efficiently. Additionally, the pristine and relatively undisturbed ice fields offer a clear view, free of vegetation, making meteorite hunting more productive.
ice flow concentration
Antarctica's ice dynamics play a crucial role in meteorite concentration. The continent's glaciers are constantly moving, albeit very slowly. As ice flows towards the edges of the continent, it brings along embedded meteorites. Over time, the movement of the ice can gather these space rocks into localized areas, particularly at the base of glaciers or in regions where the ice melts and sublimates, leaving meteorites behind. This natural process effectively 'concentrates' meteorites, turning certain spots into rich hunting grounds for researchers.
remote environment accumulation
Antarctica's remote and harsh environment also contributes to the accumulation of meteorites. Due to its extreme cold, the continent is largely uninhabited and has minimal human activity. This means meteorites that fall there are likely to remain undisturbed for thousands of years. Unlike more temperate regions where human activity might lead to the quick discovery and removal of meteorites, Antarctica's isolation allows for a significant buildup of these celestial fragments over time. This creates a sort of natural repository, providing scientists with a wealth of untouched meteorites to study.

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Most popular questions from this chapter

Relative to the stars, the moon takes 27.3 days to orbit the earth. As seen from the earth, the moon drifts eastward relative to the stars. Through what angle does the moon move eastward each day relative to the stars?

Why do comets have tails only in the vicinity of the sun? Why do these tails always point away from the sun, even when the comet is receding from it?

If the moon were smaller than it is, would total eclipses of the sun still occur? Would total eclipses of the moon still occur?

Eclipses of the sun and of the moon do not occur every month. Why not?

(a) How is it possible to distinguish the planets from the stars by observations with the unaided eye? (b) By observations with a telescope?
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