Which of the following characteristics of the Earth are essential to the existence of life 1. Earth's size causes acceleration due to gravity to be 9.8 m/s2.
2. Earth's atmosphere is composed of mostly nitrogen with oxygen and carbon
dioxide.
3. Earth's surface has an abundance of silicon oxide in the form of
sand.
4. Earth's surface temperature ranges from -88°C to 58°C.
5. Earth's magnetic field repels some solar radiation from reaching the surface.
A. 2 , 4. B 1 , 2 , 4. C 2 , 4 , 5. D. 1 , 3

What is the approximate amplitude of this wave a.10 seconds b.15 centimeters c.30 centimeters d.15 seconds

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Can anybody me with this? ? (picture included.)