Like the Earth, the Moon was bombards with meteorites during its first billion years.

• Like

• bombards

• during

• years

A newborn baby might sleeping as much as 16 hours a day in intermittent periods.

• sleeping

• much

• a day

• intermittent

Topaz has being identified in yellow, blue, green, violet, pink, and colorless varieties.

• being

• in

• colorless

• varieties

The Red Spot on Jupiter is a giant spiral storm that has been rage for more than 300 years.

• on

• spiral

• that

• rage

In medieval times, the superior officer of a soldier who had been cowardly or disloyal would broke the sword of the soldier.

• times

• cowardly

• broke

• the

The house sparrow was introduced into North America in the early 1850s, and within a century it had spreads across the continent.

• was introduced

• within

• it

• spreads

In Texas in the 1830s, thousands of Longhorn cattle were ran wild on the plains.

• thousands

• cattle

• ran

• wild

A wave may struck the shore with a force equal to the pressure of 6,000 pounds per square foot.

• struck

• equal

• per

• foot

Silk fibers produced by spiders are very fine and have proves impractical for use in textiles.

• fibers

• very fine

• proves

• for use

Our solar system is actually moves through space toward the constellation of Hercules at about 12 miles per second.

• Our

• moves

• toward

• at about