Which of the following is a true statement about mechanical weathering? Mechanical weathering changes the rock into a different mineral.
Mechanical weathering can break rocks into smaller sediments.
Mechanical weathering can only occur by volcanoes.
Earthquakes produce mechanical weathering only.

If you want to change the pitch of a sound, you have to change the question 7 options: volume speed amplitude frequency

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?