After investigating many properties of gases, Darren hypothesized that the volume of a gas is related to its temperature. Which of the following observations led to his hypothesis?

A.

All of the gases that were investigated were both odorless and colorless.

B.

A balloon filled with air expanded when it was heated and shrank when it was cooled.

C.

A syringe filled with air could be compressed when he applied pressure to the plunger.

D.

all of these

answer: 2

explanation:

yes

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.