Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
Answer:
Water from ponds and lakes is moved into the air during evaporation. During the process of evaporation, water changes from a liquid (water) to a gas (water vapor).
Explanation:
that is the correct answer
Answer:
Allows to give rise to different organs.
Explanation:
Since all the cells in our body have developed from a single cell, "the egg or ovum fertilized by a sperm", all of them are identical, that is, they have exactly the same instructions, but depending on the organ they form part, they will use only part of the information or another. This is known as cell specialization.
Thus, the nerve cells possess the information necessary to form hair and the cells that form hair possess the information necessary to form nerves. However, once specialized, nerve cells will form nerve tissue and hair cells will form hair.
In this way, being different recipes, the cells give rise to different organs.
Answer:
Yes
Explanation:
Because uranium decays by alpha particles, external exposure to uranium is not as dangerous as exposure to other radioactive elements because the skin will block the alpha particles. Ingestion of high concentrations of uranium, however, can cause severe health effects, such as cancer of the bone or liver.
6. pegmatitic (a pegmatite is a very coarse-grained intrusive igneous )
rock
7. shallow sea (limestone is the most common cemical sed rock, and they are most commonly in shallow marine environments)
8. sunlight (wind, water and ice are the primary mechanisms for the breakdown and transport of rocks and their erosional products)
9. addition of heat and pressure (heat through contact metamorphism with an igneous mass or by compression and deep burial, and pressure through tectonic forces)
10. a different metamorphic rock (this sounds like a trick question. The use of "additional pressure" implies that pressure has already been applied, in which case a metamorphic rock has already formed. Therefore, a "different metamorphic rock" will result)
11. stratification (strata are sedimentary layers)
12. sedimentary (a conglomerate)
13. extrusive (lavas have formed by "extrusion" from a volcanic edifice
14. organic (includes coal and limestone)
15. it will fizz in acid. (marble still is made up of calcium carbonate, which is the chemical which reacts with acid and fizzes)
