how did rocks get hard

The chemical bonds that hold atoms together in these minerals are stronger in some than in others, and the atoms themselves determine which bonds are stronger than others. Stronger bonds make for stronger minerals and, thus, harder rocks.

Saltwater fish must intentionally consume water to obtain enough into their systems, in addition to receiving water from osmosis. But, fish don't have to worry about becoming dehydrated because they can take in water via their skin and gills and live in water. Freshwater fish don't drink water because they have a greater blood-salt concentration than the water they are surrounded by, but seawater fish do so to prevent dehydration. hopes it helps. :)

Why go through so much trouble to study how old a rock is?

It’s hard to answer the basic questions of geology without knowing the ages of rocks. People want to know how long life has existed on Earth and what the earliest lifeform was. We’ve answered those questions by dating rocks containing fossils. Life has existed at least as long as the oldest fossil. Wouldn’t you like to know when dinosaurs lived? We’ve answered that by dating the rocks that contain dinosaur fossils. We’ve determined the age of Earth by dating meteorites. We know when the moon formed by dating moon rocks. When did the Hawaiian Islands form? Which one of the islands is the oldest? Both questions were answered by dating rocks. We can also use our dating methods to answer questions about geologic hazards. When was the last eruption of the Yellowstone Supervolcano? How frequently has Yellowstone erupted? All of these questions have been answered through methods developed by geologists to determine the ages of rocks. They are powerful techniques that answer these questions and so many more.

Sand is sediment. More specifically, sand is a size of sediment. Other common sediment sizes that you may have heard of are clay, silt, and gravel. Sand is larger than clay and silt, but smaller than gravel.

how Sedimentary rocks form into Igneous rocks

If a sedimentary rock is subjected to intense heat it will melt. Once it rises up and cools down, it will form an igneous rock

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Middle school Earth and space science - NGSS

Course: Middle school Earth and space science - NGSS > Unit 4

Lesson 1: The rock cycle

The rock cycle

NGSS.MS:

MS‑ESS2‑1

MS‑ESS2.A.1

Google Classroom

Review your understanding of the rock cycle in this free article aligned to NGSS standards.

Key points:

The rock cycle describes how rocks on Earth form and change over time.
When rocks are pushed deep below Earth’s surface, they can melt to form magma. Magma that reaches Earth’s surface through volcanic activity is called lava.
Igneous rocks form when magma or lava cools and solidifies.
Weathering breaks igneous and other types of rocks into smaller pieces called sediment. Erosion transports sediment from one place to another. Deposition drops sediment in a new location.
Sedimentary rocks form when sediment is compacted and cemented. This process is called lithification.
Metamorphic rocks form when existing rocks are exposed to intense heat and pressure. Metamorphic rocks can be formed from igneous, sedimentary, or even other metamorphic rocks.

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Emilynn
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how did rocks get hard
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- GGatorZ21
  Posted 7 months ago. Direct link to GGatorZ21's post “The chemical bonds that h...”
  The chemical bonds that hold atoms together in these minerals are stronger in some than in others, and the atoms themselves determine which bonds are stronger than others. Stronger bonds make for stronger minerals and, thus, harder rocks.
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do fish get thirsty
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- *Anonymous*
  Posted 5 months ago. Direct link to *Anonymous*'s post “Saltwater fish must inten...”
  Saltwater fish must intentionally consume water to obtain enough into their systems, in addition to receiving water from osmosis. But, fish don't have to worry about becoming dehydrated because they can take in water via their skin and gills and live in water. Freshwater fish don't drink water because they have a greater blood-salt concentration than the water they are surrounded by, but seawater fish do so to prevent dehydration.
  
  hopes it helps. :)
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Why go through so much trouble to study how old a rock is?
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- Mark
  Posted 7 months ago. Direct link to Mark's post “It’s hard to answer the b...”
  It’s hard to answer the basic questions of geology without knowing the ages of rocks. People want to know how long life has existed on Earth and what the earliest lifeform was. We’ve answered those questions by dating rocks containing fossils. Life has existed at least as long as the oldest fossil. Wouldn’t you like to know when dinosaurs lived? We’ve answered that by dating the rocks that contain dinosaur fossils. We’ve determined the age of Earth by dating meteorites. We know when the moon formed by dating moon rocks. When did the Hawaiian Islands form? Which one of the islands is the oldest? Both questions were answered by dating rocks. We can also use our dating methods to answer questions about geologic hazards. When was the last eruption of the Yellowstone Supervolcano? How frequently has Yellowstone erupted? All of these questions have been answered through methods developed by geologists to determine the ages of rocks. They are powerful techniques that answer these questions and so many more.
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is sand sediment
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  Posted 6 months ago. Direct link to Mark's post “Sand is sediment. More sp...”
  Sand is sediment. More specifically, sand is a size of sediment. Other common sediment sizes that you may have heard of are clay, silt, and gravel. Sand is larger than clay and silt, but smaller than gravel.
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how Sedimentary rocks form into Igneous rocks
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- 5119892
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  If a sedimentary rock is subjected to intense heat it will melt. Once it rises up and cools down, it will form an igneous rock
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