Which is true of the level of CO2 in our atmosphere?
A) The level of CO2 is decreasing at 3.1% per year.
B) Scientists largely believe the rapid increase is the result of volcanic activity.
C) It is reached 404 ppm in 2015.
D) The level of CO2 was much higher in 1955 than today.
E) The rate of increase leveled out in 1976.
C
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The ________ is weaker and less rigid than the overlying lithosphere
A) crust B) lower mantle C) upper mantle D) asthenosphere
Which of the following type of solid is characterized by the least order?
A) amorphous B) ionic C) molecular D) network covalent
Earth's tilt away from being perpendicular is called the angle of _______________
Fill in the blank(s) with correct word
What is the major difference between an intermittent stream that is dry part of the year and a stream that flows year-long, even when it has not rained or snowed for several weeks?
What will be an ideal response?