Josie observed that when water is boiled in an open beaker it completely disappears, leaving the beaker dry. what can josie conclude? a) mass is created in this experiment. b) mass is destroyed in this experiment. c) the mass of water is equal to the mass of water vapor produced. d) for the mass of water to be conserved during boiling, the beaker must be closed.

Option C, The mass of water is equal to the mass of water vapor produced.

Explanation:

Josie observed that when she is boiling the water,  it completely turns into water vapor/steam. From this she might have concluded that since it is the liquid water that has evaporated completely, therefore the mass of this water in gaseous phase must be equal to mass of water in liquid phase as only the phase of the substance has changed and not the substance itself. A steam or evaporated water is still water just like liquid water but is gaseous phase.

Hence , option C is correct

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !