Variations in the shape of the earth's orbit:
A) have a cycle of about 100,000 years.
B) are related to changes in sunspot activity on the surface of the Sun.
C) will eventually lead to the earth having a perfectly circular orbit.
D) have a cycle of about three million years.
A
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A valley train is a(n) _____
a. string of lakes in a glaciated valley b. deposit of till where a hanging valley entered the trunk glacier c. first-order tributary glacier d. depositional landform composed of glacial outwash left by braided streams e. ice-scoured plain
Determine the gross force needed to bring a car that is traveling at 110 km/h to a full stop in a distance of 100 m. The mass of the car is 2,100 kg. What happens to the initial kinetic energy? Where does it go or to what form of energy does the kinetic energy convert?
What will be an ideal response?
Briefly explain why temperatures increase in the thermosphere.
What will be an ideal response?
The U.S. is the world's third leading trading nation
Indicate whether the statement is true or false