When Earth is nearest the Sun, the Northern Hemisphere is experiencing
a) autumn.
b) spring.
c) summer.
d) winter.
d
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What evidence is there that Titania underwent an active geological phase? a. It has no large craters on its surface and a network of faults. b. It currently has active volcanoes on its surface
c. It is covered in methane ice. d. It has a very smooth and highly reflective surface. e. It has a large rocky core surrounded by an icy mantle.
The first living organisms to develop photosynthesis were probably
A) purple and green sulfur bacteria B) trilobites C) cyanobacteria D) stromatolites
The rotation of the magnetic fields of the jovian planets is believed to also give us the rotation rate of the planet's core
Indicate whether the statement is true or false
What is the kinetic energy of a 200-kg satellite as it follows a circular orbit of radius 8.0 × 10^6 m around the Earth? (Mass of Earth = 6.0 × 10^24 kg.)
a. 5.0 × 10^9 J b. 1.0 × 10^10 J c. 1.5 × 10^10 J d. 2.0 × 10^10 J e. 2.5 × 10^9 J