Question

Igneous and metamorphic rocks are composed of what?

Answer 1

will give a medal

Answer 2

lava

Answer 3

smaller rocks

minerals

small pieces of dirt

sand

Answer 4

Sorry, its multiple choice.

Answer 5

https://answers.yahoo.com/question/index?qid=20090728142818AAtcIT9

Answer 6

I hope this helps

Answer 7

minerals

Answer 8

gneous rocks are made from minerals that have been crystallized from molten lava.

Answer 9

igneous rocks are lava
metamorphic are rocks that have been smashed under the weight of the earth.

since lava is neither sand, dirt or smaller rocks, there is only one option left

Answer 10

Thanks.

Answer 11

more?

Answer 12

What can cause sediment to form on land?

Only mechanical weathering rocks

Only biological weathering rocks

Any kind of weathering or rocks

Melting of rock in the core

Answer 13

What is this stuff from chem 101?

Answer 14

Huh..?

Answer 15

please help

Answer 16

Weathering is the name given to the process responsible for wear, tear and breakdown of rocks, minerals and soils due to the effects of the earth’s atmosphere and ecology. Unlike erosion, which also plays a similar role, weathering does not involve any active agents like water, air or snow to carry out the wear and tear. Weathering itself is divided into two categories, mechanical and chemical.

Mechanical weathering is said to occur due to physical conditions like temperature, pressure and the presence of water and ice. Chemical weathering on the other hand, relies on chemicals in the atmosphere or those biologically produced by life forms.

Answer 17

So any kind of weathering

Answer 18

But why?

Answer 19

Nvrm

How could the rerouting of a river affect the surrounding lowland?

the land no longer floods, so it has less nutrients

the land floods more, so it has more nutrients

the land becomes a lot dryer, so plants die

the land becomes a lot wetter, so plants die

Answer 20

the land no longer floods, so it has less nutrients

Answer 21

Why that? ;/

Answer 22

Because vital minerals are carried by the river and when it floods they get scattered to the land surrounding the river

Answer 23

I thought it was C

Answer 24

But if you redirect it, it won't flood, or at least not to the point it once did and plants will be deprived of nutrients. Even though they can still get water from rain and what has seeped into the earth.

Answer 25

Ok. Hang on I have more.

Answer 26

Overgrowth of algae which produces toxins can be caused by

the water's temperature dropping quickly

too much oxygen in the water

not enough nitrogen in the water

nitrogen runoff from the use of fertilizers near the water

Answer 27

Too much oxygen

Answer 28

no wait
Nitrogen

Answer 29

It's definitely nitrogen runoff, causing oxygen depletion.

Answer 30

A rock inside a building is not likely to be affected by

mechancial weathering

chemical weathering

biological weathering

any of these

Answer 31

mechancial weathering

Answer 32

Yeah I thought that too ;]

Answer 33

Scientists can compare the dates of two different rocks to find which one is older. This process is known as what?

Absolute dating

Relative dating

Uranium 235 dating

Carbon 14 dating

Answer 34

Carbon 14 dating

Answer 35

last one
If rocks are pushed deep into the Earth's mantle, they will

become minerals

become molten rock

change into gases

become sedimentary rock

Answer 36

become molten rock

Answer 37

I don't think so. They'd become metamorphic, but that not listed. Molton rock is igneous rock.

Answer 38

When rocks are pushed deep under the Earth's surface, they may melt into magma. If the conditions no longer exist for the magma to stay in its liquid state

Answer 39

Ok

Answer 40

when it cools after that it's igneous rock

Answer 41

I got three wrong

Answer 42

Which ones

Answer 43

carbon 14 dating was wrong, mechanical weathering was wrong and, the land no longer floods, so it has less nutrients

Answer 44

Its okay. I got a 94

Answer 45

Thanks.

Answer 46

Your welcome, sorry if it was wrong. I took it from wikipedia.