AY Honors/Fossils/Answer Key 2/es
Fósiles | ||
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División Norteamericana
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Destreza: 2 Año de introducción: 1944 |
Requisitos
La especialidad de Fósiles es un componente de la Maestría Conservación. |
Conexión Logros para la Investidura: Esta especialidad está relacionada con los requisitos de Logros para la Investidura para EXPLORADOR Estudio de la naturaleza que requiere estudiar artículos que complementan esta especialidad. Esta especialidad es una elección popular para la especialidad de la categoría de Estudio de la naturaleza de nivel de destreza 2 o 3 requerido para los EXPLORADORES DE CAMPO Y BOSQUE. |
1
Fossils are found in many places where sedimentary rocks, such as claystones, shales, limestones, and sandstones, are exposed. Only certain sedimentary rocks harbored the appropriate environmental conditions to preserve and yield fossils, which are often concentrated along particular bedding planes within the rocks.
Finding Fossils
Fossils are generally found in sedimentary rock with differentiated strata representing a succession of deposited material.
2
2a
2b
2c
2d
2e
2f
2g
2h
2i
2j
2k
2l
2m
2n
2o
2p
2q
2r
2s
2t
2u
3
4
A sieve is used to separate fossils from sands and gravels. A smaller mesh is required in order to avoid losing small fossils. One practical difficulty with using sieves in the field is that they easily become clogged, especially when the material sieved has a high moisture content. However, under dry weather conditions the more durable fossils, such as teeth and bones, can be quickly and easily sieved out of loose sands. Shaking the sieve is always liable to damage or destroy fragile fossils.
If there is water available, such as on a beach or next to a stream, the material containing the fossils can be sieved wet and the matrix gradually washed away. Wet sieving is a technique that is frequently used for the collection of small mammalian fossils, and by using this technique even the smallest specimens may be recovered.
Removing gigantic fossils
Occasionally, large fragile specimens may need to be surrounded and supported using a jacket of plaster before their removal from the rock: This protects the fossil, protecting it from shattering. If a fossil is to be left in situ, a cast may be produced, using plaster of paris or latex - while not preserving every detail, such a cast is inexpensive, easier to transport, causes less damage to the environment, and leaves the fossil in place for others to enjoy. Subtle fossils which are preserved solely as impressions in sandy layers, such as the Ediacaran fossils, are usually sampled by means of a cast, which shows up detail more clearly than the rock itself.
Valuable fossils
If you find an obviously valuable fossil, you should contact a professional. It is too easy to ruin a fossil by attempting to remove it yourself. Leave the extraction in the hands of an experienced collector. If you find such a fossil on public land, contact the authority responsible for the land. The fossil belongs to them, and they have the right to decide what to do with it. To find a professional, contact a museum or a local university. If they do not have one on staff, they will be able to refer you to one.
5
Evolutionists and creationists both agree that fossils are formed when a creature is quickly buried in sediment. They disagree on how long ago this happened. Evolutionists believe most fossils were made millions of years ago. Creationists believe that nearly all fossils were made during Noah's flood less than 10,000 years ago.
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- a. Carbón
- b. Petróleo
- c. Fósiles
- d. Caliza
De Historia de Patriarcas y Profetas, p. 98, 99 |
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Por doquiera yacían cadáveres de hombres y animales. El Señor no iba a permitir que permaneciesen allí para infectar el aire por su descomposición, y por lo tanto, hizo de la tierra un vasto cementerio. Un viento violento enviado para secar las aguas, las agitó con gran fuerza, de modo que en algunos casos derribaron las cumbres de las montañas y amontonaron árboles, rocas y tierra sobre los cadáveres.
En ese tiempo inmensos bosques fueron sepultados. Desde entonces se han transformado en el carbón de piedra de las extensas capas de hulla que existen hoy día, y han producido también enormes cantidades de petróleo. Con frecuencia la hulla y el petróleo se encienden y arden bajo la superficie de la tierra. Esto calienta las rocas, quema la piedra caliza, y derrite el hierro. |
Referencias
- Categoría: Tiene imagen de insignia
- Adventist Youth Honors Answer Book/Honors/es
- Adventist Youth Honors Answer Book/es
- Adventist Youth Honors Answer Book/Skill Level 2/es
- Categoría: Libro de respuestas de especialidades JA/Especialidades introducidas en 1944
- Adventist Youth Honors Answer Book/North American Division/es
- Adventist Youth Honors Answer Book/Unknown/es
- Adventist Youth Honors Answer Book/Unknown/Primary/es
- Adventist Youth Honors Answer Book/Stage 0/es
- Adventist Youth Honors Answer Book/Conservation Master Award/es
- Adventist Youth Honors Answer Book/IAConnection/es