The solar system was formed

• 13.7 billion years ago
• 4.8 billion years ago
• 10 billion years ago
• 14 billion years ago

The outer planets are

• small and rocky
• large and rocky
• small and gaseous
• large and gaseous

The most abundant greenhouse gas is _____.

• carbon dioxide
• water vapor
• nitrogen
• methane

Changes in orbit can affect earth's ____________.

• temperature
• rotation
• abundance of gases
• tilt

The burning of coal, gas, and oil which are all fossil fuels releases __________.

• Oxygen
• Methane
• Carbon Dioxide
• Nitrogen

Which effect is a meteorite impact likely to NOT have on global climate processes?

• firestorms
• acid rain
• temperature decrease, leading to next ice age
• release gas and dust into atmosphere, blocking out sunlight

We help reduce global warming when we ________.

• conserve energy
• remove trees
• burn coal
• produce methane

The level of CO2 in our atmosphere has ______________ in recent decades.

• risen
• decreased slightly
• stayed the same
• decreased significantly

changing climate zones can lead to a shift in ____________.

• weather patterns
• gases
• temperature patterns
• environmental hazards

What has contributed to almost 1/3 of the rising sea levels?

• rivers/streams emptying into oceans
• human water consumption
• oceans warming
• glaciers melting