Only 3 questions plz answer 3. Continental drift is the idea that .

A. objects that fall into the ocean drift between the continents.
B. the continents are the only solid surface on the earth.
C. ocean waves push the continents over the surface of the earth.
D. the continents were once joined together to form a large land mass and have moved.

4.Plate tectonics refers to the theory that .

A. each of the continents on the earth is also called a plate.
B. the surface of the earth is made of large plates that cannot move.
C. the surface of the earth is made up of large plates that have moved over time.
D. the continents float on the oceans like plates.

5.What caused the caves and sinkholes we have here in Southern Indiana?

A. glaciers scraped the land flat
B. acids in the water dissolved limestone away
C. erosion made valleys

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Part a determine the magnitude of the x component of f using scalar notation. fx f x = nothing lb request answer part b determine the magnitude of the y component of f using scalar notation. fy f y = nothing lb request answer part c determine the magnitude of the z component of f using scalar notation. fz f z = nothing lb request answer provide feedback figure1 of 1a force vector acting on a ring attached to the ground is shown in the xyz space together with its x, y, and z components lying on the corresponding positive axes. the ring is located at the origin. force f is located in the first octant. f makes an angle of 60 degrees with its x component and an angle of 45 degrees with its y component. a force vector acting on a ring attached to the ground is shown in the xyz space together with its x, y, and z components lying on the corresponding positive axes. the ring is located at the origin. force f is located in the first octant. f makes an angle of 60 degrees with its x component and an angle of 45 degrees with its y component.