When two stars are bound together gravitationally and orbit a common mass, they're known as

A. constellations.

B. meteoroids.

C. galaxies.

D. binary stars.

If Earth's obliquity was 157 degrees, would the seasons be more severe, less severe, or about the same?

Describe the relationship of the Earth's lithosphere to the asthenosphere.

Match the element with its description. Match Term Definition Sodium A) Highly reactive gas Silicon B) Nonreactive gas Bromine C) Has properties of both metals and nonmetals Argon D) Malleable, soft, and shiny

Dicuss the law of conservation of energy. Provide atleast one example that supports your description

What is the law of inertia?

A small kid sits on a bike (Anita). A bigger and stronger person (Jamy) pushing the kid so that the kid starts speeding up. (neglect friction). Mark all correct statements about the forces between them. A.

A ___ is awarded to the opposing team when that team violently or dangerously charges a opponent. (in soccer) A) Goalie kick B) Indirect kick C) Direct kick D) Throw in

Which has greater potential energy, a book on the top shelf of a bookcase or a book on the bottom shelf? Why?

Fusion occurs with atoms of elements less massive than a. iron. b. helium. c. calcium. d. uranium.

Which describes what happens when fuel is ignited in a heat engine? A. Chemical energy is converted into thermal energy B. Thermal energy is converted into solar energy. C. Solar energy is converted into chemical energy D.