Without convection, there would be no volcanoes on Earth because
A) all the convecting material spurts out at the surface.
B) rising mantle material undergoes decompression melting.
C) molten outer-core melts the lower continental crust.
D) volcanoes sink down into Earth near down-going convention cells.
Question 2
Judge the following sentences according to the criteria given below. Ice cubes are dropped in a glass of warm water and float to the top. The ice cubes rose to the top of the glass of warm water because the frozen ice is colder than the warm water.
A) The assertion is correct but the reason is incorrect.
B) The assertion is incorrect but the reason is correct.
C) The assertion and the reason are both correct, and the reason is valid.
D) The assertion and the reason are both correct, but the reason is invalid.
E) Both the assertion and the reason are incorrect.
False-color imagery of the Sun, a G-type main-sequence star, the closest to Earth.
Rivers on Mars and Earth
Changes in Earth’s Orbit
Escape Speed from Earth
Earth 600 Million Years Ago
Earth 430 Million Years Ago