Obliquity, i.e. variations in the Earth's axial tilt, range from ________ to ________ over a 41,000-year cycle.
A) 10.5 to 24.5
B) 20.5 to 23.5
C) 11.5 to 15.5
D) 23.5 to 27.5
E) 21.5 to 24.5
Question 2
Broadly defined, the biosphere
A) only includes the biotic components of an ecosystem, with the abiotic components being considered part of the lithosphere, hydrosphere, or atmosphere, respectively.
B) extends from the ocean floor to an altitude of approximately 8 km (5 mi) into the atmosphere.
C) is more a theoretical construct than an observable sphere of study.
D) consists of only terrestrial organisms, while the hydrosphere includes aquatic and marine organisms.
E) encompasses both the lithosphere and the hydrosphere, but not the atmosphere.
Life on Earth
Tides on Earth
Layers are deposited parallel to Earth’s surface. Younger layers are deposited on top of older layer
Earth’s Spheres
Range of motion at the shoulder and hip joints Cont.
Alpine tundra. Low-growing, hardy plants at a high altitude in Washington’s Cascade range.