Why is it necessary for certain chemical reactions to be catalyzed

Explanation:

Catalysts modifiy the path for the chemical reactions lowering the activation energy.

The activation energy is the energy that the reactants must acquire in order to the collisions between the substances have the needed energy to break the bonds and form new products. In this form the rate of the reaction is increased such that the formation of the products is relevant.

Catalysts do not modify the energy of the reactants but provide a new pathway for which the activation energy is lower making that more collisions effectively yield the new products.

answer: "circumcision is a common procedure in which the skin covering the tip of the penis is surgically removed."

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 !