Geography

Geography, 14.07.2019 21:30, kyllow5644

"what and where are the oldest rocks on earth and what is their age? "

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Chemistry, 21.07.2019 21:30, nataliastrong3846

Some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. is it likely that these rocks were present when earth was first formed? a. no, rock material is constantly recycled on earth as rock is melted into magma. b. yes, most of the rocks on earth can be dated back to the time when earth was first formed. c. no, this rock is probably just a sedimentary rock that was formed by much younger igneous rocks. d. no, it is likely that any rocks older than a few hundred years are meteorites from outer space.

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Biology, 13.09.2019 03:30, maria5633

Based on radiometric dating, the oldest rocks scientists have found on earth are 4.6 billion years old, but not all rocks are that old. why might some rocks be 4.6 billion years old, and other rocks are only 2 billion years old, while yet others are only a few thousand years old? include an example and the names of at least 2 rock types and how they are formed.

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Social Studies, 26.09.2019 05:00, galaxychild101

Oceanic crust is denser than continental crust. so when the two meet, oceanic crust subducts under continental crust. this fact best supports which claim? a.the hardest rocks on earth are in the oceanic crust.b.the hardest rocks on earth are in the continental crust.c.the oldest rocks on earth are in the oceanic crust.d.the oldest rocks on earth are in the continental crust.3.a geologic cross section of the himalayan mountain range is shown below.

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Geography, 26.09.2019 19:10, jhaveen8335

The oldest material found on earth is a zircon grain that is 4.12 ga. how come there are no rocks that are the same age as earth (4.54 ga)? (a) no rocks formed during that time. (b) all rocks from that age have been recycled. (c) earth is not that old. (d) we just have not found them yet.

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