ACT English - WIN

Snowflakes form from tiny water droplets, following a specific process of chemical bonding as they freeze, which results in a six-sided figure.

• A. No change

• B. form, from tiny, water droplets,

• C. form from tiny, water, droplets

• D. form, from tiny water droplets

The rare "triangular" snowflake, similarly, confounded scientists for years because it apparently defied the basic laws of chemistry.

• F. No change

• G. for example,

• H. additionally,

• J. however,

The seemingly triangular shape of those snowflakes suggests that forming through a different process of chemical bonding.

• A. No change

• B. the manner in which formation

• C. which had formed

• D. that they form

By re-creating snowflake formation, a discovery has revealed to scientists Kenneth Libbrecht and Hannah Arnold the cause of this apparent variation.

• F. No change

• G. the discovery of the cause of this apparent variation has been made by scientists Kenneth Libbrecht and Hannah Arnold

• H. scientists Kenneth Libbrecht and Hannah Arnold have discovered the cause of this apparent variation.

• J. the cause of this apparent variation has been discovered by scientists Kenneth Libbrecht and Hannah Arnold

Snowflakes begin to form when water in the atmosphere freezes it causes the water molecules to bond into a hexagonal shape.

• A. No change

• B. freezes, causing

• C. freezes, it causes

• D. freezes, this causes

During the flake's descent from Earth's upper atmosphere, other water vapor molecules bumps into the hexagonal structure.

• F. No change

• G. has bumped

• H. bumped

• J. bump

The triangular shape is an illusion resulting from one significant addition to the process dust.

• A. No change

• B. process is

• C. process:

• D. process;

In 2009, Libbrecht and Arnold's experiments revealed that triangular snowflakes begin with the same process of chemical bonding and forms a hexagonal shape.

• F. No change

• G. were they to form

• H. if they formed

• J. form

Triangular snowflakes begin to form when a tiny dust particle or other such impurity collides with the flake as it falls, thereby pushing one edge upward. The greater the pressure from the wind, causes bonds to form quick at this edge than in the rest of the snowflake.

• A. No change

• B. more quickly

• C. most quickly

• D. quickest

The resulting snowflake has three long sides and three sides that are so short they are difficult to detect. Although these snowflakes appear to have a triangular shape--they actually have a hexagonal pattern.

• F. No change

• G. shape,

• H. shape;

• J. shape: