Unit 1.4 Climate change

Fill in the blank: The word 'slush' refers to __.

• partially melted snow or ice

• a type of hot beverage

• a kind of tropical fruit

• a musical instrument

Fill in the blank: 'Mass extinction' is a term used to describe the event __.

• when a large number of species die out in a relatively short period of time

• when a single species evolves rapidly

• when new species are discovered in a short period of time

• when the climate remains unchanged for millions of years

What are greenhouse gases?

• Gases that cool the Earth

• Gases that help keep the Earth warm

• Gases that are only found in greenhouses

• Gases that are not found in the atmosphere

What is the long-term pattern of temperatures, wind, and rainfall on Earth called?

• Weather

• Climate

• Season

• Atmosphere

About how many years ago did the Earth experience the first ice age?

• 650 million years ago

• 2 billion years ago

• 100 million years ago

• 10,000 years ago

Fill in the blank: In the warm periods, there was no ______ at all, even at the poles. In the colder periods, called ice ages, there was ______ at the poles.

• ice, ice

• snow, rain

• water, snow

• wind, fog

What is the term scientists use for a time when the whole Earth was covered with ice and snow?

• Ice Age

• Greenhouse Earth

• Snowball Earth

• Iceball Earth

According to the passage, around how many million years ago did two asteroids collide with each other in space, somewhere in-between Earth and Mars?

• Around 470 million years ago.

• Around 150 million years ago.

• Around 1,200 million years ago.

• Around 50 million years ago.

What was one major effect of the asteroid collision that produced huge quantities of dust, as described in the passage?

• The dust reduced the amount of light and heat from the Sun reaching the Earth's surface, triggering an ice age.

• The dust increased the oxygen levels in the atmosphere, leading to rapid plant growth.

• The dust caused the Earth's magnetic field to reverse, affecting animal migration.

• The dust led to the formation of new mountain ranges across the continents.

The collision of two asteroids in space caused the Earth's temperature to rise significantly.

• True

• False